You could probably tweak something like Barrier for the kvm/cursor move, and use XPRA to move the window, sure. No idea how much/little work it'd be but doesn't seem like it should be all that complex.

It has been taken much further since:

https://arcan-fe.com/2023/11/18/a12-visions-of-the-fully-net...

The actual project work is also sponsored by NLnet and received new grants:

https://nlnet.nl/project/Arcan-A12-directory/ https://nlnet.nl/project/Arcan-A12-tools/

This was very cool, and is made in Arcan! https://arcan-fe.com/ a project I just recently discovered and am very excited about

There're a few options (including outdated) that can be used to replicate this workflow. Easiest being winswitch (which is based on xpra).