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Crazy idea I've always wanted to try: somehow hack a USB foot-pedal to act as a layer key.

(Hard, because usually the layers are implemented inside the keyboard's firmware, rather than being processed by the OS. Maybe the foot-pedal would need to plug into the keyboard.)

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Layers in software are thing with eg. kmonad or kanata

Doesn't work for keys that don't send keysyms by default but instead act as e.g. media keys if you're not holding a modifier. (Media keys are their own USB HID usage page; the OS keyboard driver doesn't see them.)

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