Well this rang the ol’ memory bells and brought me to Daniel’s Nim drivers for our Pico based products (1). He’s probably the guy to talk to.

Not needing a Python wrapper would definitely help slim down FrameOS into something you could stuff into a fast-loading initrd I guess?

I did something similar with Keybow, static binaries and a custom build system (2) to make a sort-of Pi (Zero) based appliance.

1. https://github.com/daniel-j/nim-pimoroni-pico/tree/master

2. https://github.com/ali1234/rpi-ramdisk