It's not something I've looked into, but I know some people obsess over keyboards. Do the old computers use the same controllers for their keyboards? I vaguely remember doing stuff on the Beeb to read when more than one key was pressed. Since then I've used the old DIN plug keyboards and PS/2 before it all went USB.

3D printers open more options if you can print your own keys. I need to look into Tinkercad as someone at work recommended it.

!BEER