Honestly I was just about to straight up say no, since I feel like I’m way to new to Qubes to start making changes. But then I looked at the source code and honestly I’m going over and over this in my head and can’t really imagine any serious obstacles? I’m probably missing something very obvious.
That said I’ll probably still pass on this for couple of reasons: for one I’m a lazy leech and if I were to do some actual work there are subsystems that need much more love than the clipboard (cough cough firewall? cough); and what’s there already is working.
But honestly my main problem is I don’t think I’d be comfortable using any software that accepts PRs from me 
It took my brain an embarrassing amount of time to process this joke 
Thank you very much for this!