i did it alot more basic , but does the same trick
set .decl in filter , then regex , select files , subfolders , set name and path length to 999 is to select in crop :after and input .decl and make sure under renaming options > rename file extensions as being part of the filename and make sure the other option for folders is disable
well thats quite interesting info to know , thanks alot for that my dude , you got em skillz for sure , ill be checking out all the other goodies you guys got for bulk rename going on