@bkg2k I understand why Recalbox wouldn't include Pico-8. That's a very reasonable stance. But I don't understand why someone would say "And, it's against Recalbox's usage policy to use non-opensource emulators, so you won't get help for that here.". It's one thing to say you won't distribute non-open source emulators and another to say that the usage policy doesn't allow it.
Usually there is some sort of mechanism for launching 3rd party apps or overriding the built in apps that I've seen with other emulator focused distros. Is that just not possible with how Recalbox is setup today?