The UI works on the Proš, yes.
If you want to use another distribution with XWayland
Did you use the "init contianer config" and "setup xsession" buttons at the bottom of the container view in harbour-containers, advanced controls? Theoretically they should build Xwayland which should take about 10 minutes, then setup DE/WM, and after that you should be able to start the Xsession from the button above.