Parsec can be workable, the two issues I ran into were that your audio setup might not like it and you might have to use a virtual device/switch off of ASIO or similar for a screen share. The other was that drawing automation curves could be a little awkward on a client box.

I think with something like syncthing + taking turns as host if automation still has issues and a virtual output you can probably get a good flow going, even if not perfect.