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What about every computer up to the 90s for ~10€ of hardware to house inside of an existing keyboard?

(or your subset of favorites)

You can do this with a Rasberry Pi 400, no problem. I have one running https://retropie.org.uk/ and it works great.

a Rasberry Pi 400 is ~90€

Yep! Suuper nice though!

...or add such functionality to a USB hub ;)