Can steam deck run any Linux application? You might have fun designing creative abstractions in Pure Data meant to fit in the UI. Then, if you can hook it up to a keyboard, you might be able to take advantage of the user inputs on the steam deck & keyboard to make an ersatz OP-1.
On top of that, it's basically just Arch linux with a complicated filesystem scheme. Flatpaks are the recommended distribution mechanism, but you can do whatever you want. It comes with KDE and an X server out of the box.
