It's not always a good idea to have your software auto restart on error...
I gave a bunch of keyboard/mouse sharing tools another look on CachyOS and after many "well.. this ain't working" and some more browsing of various GH issues that are open and unresolved for years, my understanding is now that... Wayland people don't seem to give a lot of shit. Apparently there *are* protocols, but nobody dares to implement them.
It's a bummer really, because both Niri and MangoWM look very intriguing to me. But I kind of lean on tools like Barrier or Deskflow in my daily use right now, and I don't want to juggle mice and keyboards when the convenient alternative is to just stay on Kubuntu/X11.