@rasta
Did you have a look at this thread?
I didn’t try things out since then so I don’t know about improvements or anything else but at least back then I could start the guiVMSession and start apps the way described in the linked thread above.
I didn’t experiment with sys-gui-gpu yet because I read that it was tested to work with intel rather than AMD. I have a dedicated gpu so I will try this in the future.