Phil Howard posts on Twitter how to turn the Raspberry Pi 400 computer into a USB HID keyboard for another computer.
Yes, the Raspberry Pi Foundation does sell a regular USB keyboard one can use with any computer. But if you want more of a Swiss Army knife rather than a single blade, the Pi 400 is definitely the ticket.
The code to perform the magic is on GitHub here.
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Someone actually did a (probably better) version right after me, see: https://github.com/librerpi/rpi-tools/blob/master/keyboard-proxy/main.c
I think the latest build is here: https://hydra.angeldsis.com/build/105678