For the moment, Devuan does everything I need or want. My main reason for
wanting to be able to test other distros, etc., is that things change: that
is, maybe in another five or ten years, Devuan will go the same way as
Debian, or worse Ubuntu, and "freedom" will come to be redefined in a more
commercially or politically acceptable manner. It's good to have options,
just in case the winds start blowing in a different direction.
Perhaps you should have a look at
https://distrotest.net.
You can test other distros in a remove VM. You can also VNC into them if you wish.
Cheers
Michele