You can probably use some flavour of Plan 9 on a Pi Zero variant to do the
authentication stuff, if you're OK with running that on ARM cores attached to a
media processor running a variant of ThreadX. Other similar form factor boards
are available.
You could also run Inferno on a smaller system and potentially do something
similar. I haven't looked at the Pi Pico port in a while. Maybe it could be
persuaded to talk over the USB port instead of a UART. I'm looking at Pico
2-related boards and hope that I can figure out USB device support.
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