My only gripe is that these newer wm's require hardware acceleration. It's hard to try them out in a VM, and committing to a hardware install is a big ask for anyone that's been using something else for a while.
Many wayland compositora can run as clients of another compositor.
So you can run a niri session inside of a gnome sesson for example. No need for a VM.
Just install sway and run it from a different tty
You can often install packages in a live system ("try" option of installation medium). The backing storage for that is a RAM disk overlay. Did you not know or is that too short-lived for you for a proper trial?
You don't have to remove other WMs to try a new one. Most login managers will let you choose at login.