This exists for CLAP: https://cdm.link/sndstation-linux-distro-for-game-handhelds/; you can watch a preview of what one of the authors created for it here: https://youtu.be/0cHvzRsJg-A.

A couple of these exist in guitar pedal form for lv2 (which is a dead format): Mod Audio Dwarf, and pistomp.

Nothing for VST3 that I'm aware of. Maybe the new Akai stuff?

Friends of mine are making sndstation, I was going to mention it. That's Baconpaul, and that's the demo that got me to buy a cheap linux handheld :)

It's not so much for CLAP, as it is 'make little synths and games and grooveboxes and toys that will run on a little game-box which has D-pads and joysticks'. In a sense this will be even more fun than an FM-1, plus more of a fun platform to work with. You just have to be able to run on a little Linux machine. There'll be a dev kit and everything. It's kind of new :)