QuestCraft launches but when I try to launch actual Minecraft it complains about a ton of missing libraries. But that doesn’t look like an unsolvable problem to me.

You can add non-Steam games to Steam for use with Lepton with the steamos-add-to-steam commandline script. You just have to modify it to allow files of the type “application/vnd.android.package-archive”. To modify it you could copy the script from /usr/bin to your home (like ~/.local/bin) and call it there.

I’ve also tried the Prism route without any luck so far. Will try again when I find the energy.