Search Result filtering by {searchterm} and URL parameter

[CSTAZ]

I have a general search page where all the searches will be forwarded from my sharepoint site with the following structure
"SitePages/Search.aspx?q=686723&k=686723"
On this search page i have a PNP searchbox and a PNP search result with the following Query Template
"
{searchTerms}
(Path: "https://x.y.com/sites/INTRA/" OR Path: "https://x.y.com/sites/Extra/") AND (RefinableString150:a* OR RefinableString150:b* OR RefinableString150:c* OR RefinableString150:d* OR RefinableString150:e* OR RefinableString150:f* OR RefinableString150:g* OR RefinableString150:h* OR RefinableString150:i* OR RefinableString150:j* OR RefinableString150:k* OR RefinableString150:l* OR RefinableString150:m* OR RefinableString150:n* OR RefinableString150:o* OR RefinableString150:p* OR RefinableString150:q* OR RefinableString150:r* OR RefinableString150:s* OR RefinableString150:t* OR RefinableString150:u* OR RefinableString150:v* OR RefinableString150:w* OR RefinableString150:x* OR RefinableString150:y* OR RefinableString150:z*) AND DepartmentId:{{Hub.HubSiteId}} AND IsDocument:True

"

1. ) I searched a lot but i don´t find a way how to get search working with URL Param or with the Searchterm in the same query
2. ) Is there a way for RefinableString150!="" instead of this long query

I use PnP Modern Search - Search Web Parts - v4 (V4.0.0.0)