Well. That is a completely different level of desktop integration.
It surely makes sense to have that, and dbus-over-vsock looks like
a reasonable choice.
(using vsock & dbus also goes in the direction where UIs and remote server can run in different processes and come and go btw)
But I'm more after a solution for the "paste that long link into the
guest firefox" problem, without putting everything upside-down 😊
In this case, I would say an agent-less text-to-type solution (even with its very limited scope) is quite attractive.