So are you saying that’s pretty much what the outcome will be by following the steps you listed?
As so often: it depends: while you can easily run a Phosh session on x86 (i run Phosh as my main desktop on a laptop) whether the forwarding works depends on the forwarding solution (vnc, rdp, …) and how that forwards the touch events (so you get proper multitouch rather than an emulated mouse pointer, etc). No idea what the state is today but in the past VNC didn’t have support for touch events. I think RDP has support but then it depends on the client and server implementing it (see e.g. Forward Touch events over RDP (#2949) · Issues · Remmina / Remmina · GitLab ) .
Since Purism mentions hosting Android apps on remote systems in their (closing the app gap the might have already thought about a solution for this though).