Thanks, this Actually Works and is a nice Workaround.
It’s a Very Specific Solution to a Specific Problem, that must be known, by the User, as the Sunshine Docu, don’t Mention the Prependix.
Would be probably a Good Idea to append it to the NixOS Wiki Entry.
Will do so after some Time, but im still happy to hear about other Solutions, that Could Save the User some Time Googling this Specific Problem, and make the Application Function as Expected without needing Specific NixOs Workarounds.
Thank you for taking Time for me, I appreciate your Answer a lot.