I think what you want is retroarch
this post was submitted on 26 Dec 2023
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On the same sdcard? You could use PINN for multi boot and try to migrate the raspios partition there but tbh if you don't want to reinstall I thin it's easier and safer to keep each os install to a different sdcard. They are simply too cheap.
I was thinking like an app, the same way it would work on a regular desktop. Is that possible?
That’s called “RetroArch”.