[sokoloff]

I'm willing to lend a hand, but while I've got some ESP32 and other microcontroller/sensor programming experience, I have absolutely no USB peripheral development experience.

From a high-level point of view, I would naively expect that eye tracking/eye-based control would be far more desirable than using IMUs and buttons. It seems like it would be exhausting to control a computer with head movements, while our eyes move quickly around all the time we're awake already. (I'm still willing to help as I can, but I wanted to make sure that you're pretty sure this a viable path.)