diff --git a/dedalus/core/transforms.py b/dedalus/core/transforms.py
index 982da237..00758fb2 100644
--- a/dedalus/core/transforms.py
+++ b/dedalus/core/transforms.py
@@ -20,8 +20,8 @@
 logger = logging.getLogger(__name__.split('.')[-1])
 
 from ..tools.config import config
-FFTW_RIGOR = lambda: config['transforms-fftw'].get('PLANNING_RIGOR')
-DEALIAS_BEFORE_CONVERTING = lambda: config['transforms'].getboolean('DEALIAS_BEFORE_CONVERTING')
+GET_FFTW_RIGOR = lambda: config['transforms-fftw'].get('PLANNING_RIGOR')
+GET_DEALIAS_BEFORE_CONVERTING = lambda: config['transforms'].getboolean('DEALIAS_BEFORE_CONVERTING')
 
 
 def register_transform(basis, name):
@@ -99,13 +99,16 @@ class JacobiTransform(SeparableTransform):
     TODO: We need to define the normalization we use here.
     """
 
-    def __init__(self, grid_size, coeff_size, a, b, a0, b0):
+    def __init__(self, grid_size, coeff_size, a, b, a0, b0, dealias_before_converting=None):
         self.N = grid_size
         self.M = coeff_size
         self.a = a
         self.b = b
         self.a0 = a0
         self.b0 = b0
+        if dealias_before_converting is None:
+            dealias_before_converting = GET_DEALIAS_BEFORE_CONVERTING()
+        self.dealias_before_converting = dealias_before_converting
 
 
 @register_transform(basis.Jacobi, 'matrix')
@@ -125,7 +128,7 @@ def forward_matrix(self):
         base_transform = (base_polynomials * base_weights)
         # Zero higher coefficients for transforms with grid_size < coeff_size
         base_transform[N:, :] = 0
-        if DEALIAS_BEFORE_CONVERTING():
+        if self.dealias_before_converting:
             # Truncate to specified coeff_size
             base_transform = base_transform[:M, :]
         # Spectral conversion
@@ -134,7 +137,7 @@ def forward_matrix(self):
         else:
             conversion = jacobi.conversion_matrix(base_transform.shape[0], a0, b0, a, b)
             forward_matrix = conversion @ base_transform
-        if not DEALIAS_BEFORE_CONVERTING():
+        if not self.dealias_before_converting:
             # Truncate to specified coeff_size
             forward_matrix = forward_matrix[:M, :]
         # Ensure C ordering for fast dot products
@@ -286,8 +289,18 @@ def backward(self, cdata, gdata, axis):
         np.copyto(gdata, temp)
 
 
+class FFTWBase:
+    """Abstract base class for FFTW transforms."""
+
+    def __init__(self, *args, rigor=None, **kw):
+        if rigor is None:
+            rigor = GET_FFTW_RIGOR()
+        self.rigor = rigor
+        super().__init__(*args, **kw)
+
+
 @register_transform(basis.ComplexFourier, 'fftw')
-class FFTWComplexFFT(ComplexFFT):
+class FFTWComplexFFT(FFTWBase, ComplexFFT):
     """Complex-to-complex FFT using FFTW."""
 
     @CachedMethod
@@ -295,7 +308,7 @@ def _build_fftw_plan(self, gshape, axis):
         """Build FFTW plans and temporary arrays."""
         dtype = np.complex128
         logger.debug("Building FFTW FFT plan for (dtype, gshape, axis) = (%s, %s, %s)" %(dtype, gshape, axis))
-        flags = ['FFTW_'+FFTW_RIGOR().upper()]
+        flags = ['FFTW_'+self.rigor.upper()]
         plan = fftw.FourierTransform(dtype, gshape, axis, flags=flags)
         temp = fftw.create_array(plan.cshape, np.complex128)
         return plan, temp
@@ -522,7 +535,7 @@ def backward(self, cdata, gdata, axis):
 
 
 @register_transform(basis.RealFourier, 'fftw')
-class FFTWRealFFT(RealFFT):
+class FFTWRealFFT(FFTWBase, RealFFT):
     """Real-to-real FFT using FFTW."""
 
     @CachedMethod
@@ -530,7 +543,7 @@ def _build_fftw_plan(self, gshape, axis):
         """Build FFTW plans and temporary arrays."""
         dtype = np.float64
         logger.debug("Building FFTW FFT plan for (dtype, gshape, axis) = (%s, %s, %s)" %(dtype, gshape, axis))
-        flags = ['FFTW_'+FFTW_RIGOR().upper()]
+        flags = ['FFTW_'+self.rigor.upper()]
         plan = fftw.FourierTransform(dtype, gshape, axis, flags=flags)
         temp = fftw.create_array(plan.cshape, np.complex128)
         return plan, temp
@@ -553,14 +566,14 @@ def backward(self, cdata, gdata, axis):
 
 
 @register_transform(basis.RealFourier, 'fftw_hc')
-class FFTWHalfComplexFFT(RealFourierTransform):
+class FFTWHalfComplexFFT(FFTWBase, RealFourierTransform):
     """Real-to-real FFT using FFTW half-complex DFT."""
 
     @CachedMethod
     def _build_fftw_plan(self, dtype, gshape, axis):
         """Build FFTW plans and temporary arrays."""
         logger.debug("Building FFTW R2HC plan for (dtype, gshape, axis) = (%s, %s, %s)" %(dtype, gshape, axis))
-        flags = ['FFTW_'+FFTW_RIGOR().upper()]
+        flags = ['FFTW_'+self.rigor.upper()]
         plan = fftw.R2HCTransform(dtype, gshape, axis, flags=flags)
         temp = fftw.create_array(gshape, dtype)
         return plan, temp
@@ -756,14 +769,14 @@ def backward(self, cdata, gdata, axis):
 
 
 #@register_transform(basis.Cosine, 'fftw')
-class FFTWDCT(FastCosineTransform):
+class FFTWDCT(FFTWBase, FastCosineTransform):
     """Fast cosine transform using FFTW."""
 
     @CachedMethod
     def _build_fftw_plan(self, dtype, gshape, axis):
         """Build FFTW plans and temporary arrays."""
         logger.debug("Building FFTW DCT plan for (dtype, gshape, axis) = (%s, %s, %s)" %(dtype, gshape, axis))
-        flags = ['FFTW_'+FFTW_RIGOR().upper()]
+        flags = ['FFTW_'+self.rigor.upper()]
         plan = fftw.DiscreteCosineTransform(dtype, gshape, axis, flags=flags)
         temp = fftw.create_array(gshape, dtype)
         return plan, temp
@@ -791,11 +804,11 @@ class FastChebyshevTransform(JacobiTransform):
     Subclasses should inherit from this class, then a FastCosineTransform subclass.
     """
 
-    def __init__(self, grid_size, coeff_size, a, b, a0, b0):
+    def __init__(self, grid_size, coeff_size, a, b, a0, b0, **kw):
         if not a0 == b0 == -1/2:
             raise ValueError("Fast Chebshev transform requires a0 == b0 == -1/2.")
         # Jacobi initialization
-        super().__init__(grid_size, coeff_size, a, b, a0, b0)
+        super().__init__(grid_size, coeff_size, a, b, a0, b0, **kw)
         # DCT initialization to set scaling factors
         if a != a0 or b != b0:
             # Modify coeff_size to avoid truncation before conversion
@@ -817,7 +830,7 @@ def __init__(self, grid_size, coeff_size, a, b, a0, b0):
             self.resize_rescale_backward = self._resize_rescale_backward
         else:
             # Conversion matrices
-            if DEALIAS_BEFORE_CONVERTING() and (self.M_orig < self.N): # truncate prior to conversion matrix
+            if self.dealias_before_converting and (self.M_orig < self.N): # truncate prior to conversion matrix
                 self.forward_conversion = jacobi.conversion_matrix(self.M_orig, a0, b0, a, b).tocsr()
             else: # input to conversion matrix not truncated
                 self.forward_conversion = jacobi.conversion_matrix(self.N, a0, b0, a, b)
@@ -855,7 +868,7 @@ def _resize_rescale_forward_convert(self, data_in, data_out, axis, Kmax_DCT):
             posfreq_odd = axslice(axis, 1, Kmax_DCT+1, 2)
             data_in[posfreq_odd] *= -1
         # Ultraspherical conversion
-        if DEALIAS_BEFORE_CONVERTING() and self.M_orig < self.N: # truncate data
+        if self.dealias_before_converting and self.M_orig < self.N: # truncate data
             goodfreq = axslice(axis, 0, self.M_orig)
             data_in = data_in[goodfreq]
         apply_sparse(self.forward_conversion, data_in, axis, out=data_out)
@@ -1333,7 +1346,7 @@ class DiskRadialTransform(NonSeparableTransform):
         - Remove dependence on grid_shape?
     """
 
-    def __init__(self, grid_shape, basis_shape, axis, m_maps, s, k, alpha, dtype=np.complex128):
+    def __init__(self, grid_shape, basis_shape, axis, m_maps, s, k, alpha, dtype=np.complex128, dealias_before_converting=None):
         self.Nphi = basis_shape[0]
         self.Nmax = basis_shape[1] - 1
         super().__init__(grid_shape, self.Nmax+1, axis, dtype)
@@ -1341,6 +1354,9 @@ def __init__(self, grid_shape, basis_shape, axis, m_maps, s, k, alpha, dtype=np.
         self.s = s
         self.k = k
         self.alpha = alpha
+        if dealias_before_converting is None:
+            dealias_before_converting = GET_DEALIAS_BEFORE_CONVERTING()
+        self.dealias_before_converting = dealias_before_converting
 
     def forward_reduced(self, gdata, cdata):
         # local_m = self.local_m
@@ -1396,14 +1412,14 @@ def _forward_matrices(self):
                 # Zero higher coefficients than can be correctly computed with base Gauss quadrature
                 dN = abs(m + self.s) // 2
                 W[max(self.N2g-dN,0):] = 0
-                if DEALIAS_BEFORE_CONVERTING():
+                if self.dealias_before_converting:
                     # Truncate to specified coeff_size
                     W = W[:max(self.N2c-Nmin,0)]
                 # Spectral conversion
                 if self.k > 0:
                     conversion = dedalus_sphere.zernike.operator(2, 'E')(+1)**self.k
                     W = conversion(W.shape[0], self.alpha, abs(m + self.s)) @ W
-                if not DEALIAS_BEFORE_CONVERTING():
+                if not self.dealias_before_converting:
                     # Truncate to specified coeff_size
                     W = W[:max(self.N2c-Nmin,0)]
                 m_matrices[m] = np.asarray(W.astype(np.float64), order='C')
@@ -1434,7 +1450,7 @@ def _backward_matrices(self):
 @register_transform(basis.BallBasis, 'matrix')
 class BallRadialTransform(Transform):
 
-    def __init__(self, grid_shape, coeff_size, axis, ell_maps, regindex, regtotal, k, alpha, dtype=np.complex128):
+    def __init__(self, grid_shape, coeff_size, axis, ell_maps, regindex, regtotal, k, alpha, dtype=np.complex128, dealias_before_converting=None):
         self.N3g = grid_shape[axis]
         self.N3c = coeff_size
         self.ell_maps = ell_maps
@@ -1443,6 +1459,9 @@ def __init__(self, grid_shape, coeff_size, axis, ell_maps, regindex, regtotal, k
         self.regtotal = regtotal
         self.k = k
         self.alpha = alpha
+        if dealias_before_converting is None:
+            dealias_before_converting = GET_DEALIAS_BEFORE_CONVERTING()
+        self.dealias_before_converting = dealias_before_converting
 
     def forward(self, gdata, cdata, axis):
         # Make reduced view into input arrays
@@ -1506,14 +1525,14 @@ def _forward_GSZP_matrix(self):
                     # Zero higher coefficients than can be correctly computed with base Gauss quadrature
                     dN = (ell + self.regtotal) // 2
                     W[max(self.N3g-dN,0):] = 0
-                    if DEALIAS_BEFORE_CONVERTING():
+                    if self.dealias_before_converting:
                         # Truncate to specified coeff_size
                         W = W[:max(self.N3c-Nmin,0)]
                     # Spectral conversion
                     if self.k > 0:
                         conversion = dedalus_sphere.zernike.operator(3, 'E')(+1)**self.k
                         W = conversion(W.shape[0], self.alpha, ell+self.regtotal) @ W
-                    if not DEALIAS_BEFORE_CONVERTING():
+                    if not self.dealias_before_converting:
                         # Truncate to specified coeff_size
                         W = W[:max(self.N3c-Nmin,0)]
                     # Ensure C ordering for fast dot products