Oh dude! I have this available in Guix too! I have to give it a go.
The main problem I have with windows is it’s hard for me to test, so even if I use some kind of installer tool I have no chance to test it properly so I can’t send it to my clients directly… It’s kind of an issue, but this looks really promising. I may write a new post with my findings soonish, and I’ll include this one along with a review of my experience with Kawa. Thanks for sharing your knowledge. It’s greatly appreciated!