I’m not much hoepful, but… just in case :)
I would like to be able to start a second session in a window of my current one (I mean a second session where I log in as a different user, similar to what happens with the various ctrl+alt+Fx, but starting a graphical session rather than a console one).
Do you know of some software that lets me do it?
Can I somehow run a KVM using my host disk as a the disk for the guest VM (and without breaking stuff)?
Sway-wm used to be spawnable as a child window, not sure if that is still possible.
I think you should also be able to get multiple ctrl-alt-fX graphical sessions.
I’ll come back and update this comment when I get to my PC and give this a try.
Edit: seem Max-P’s comment.