This is getting a tad off-topic, not that I care particularly. I was doing some Googling and ran across https://forum.linuxcnc.org/ which might have something appropriate. I'd never heard of it.
http://www.surpluscenter.com/ was what I was Googling for, also Herbach and Rademan, https://www.sciplus.com (was jerryco), Electronics Goldmine, All Electronics Any of these places might have something in keyboards, at least until they sell it out. I used to work in R&D and part of my job was to maintain a file cabinet of catalogs and report anything that looked useful. I left that job in 1990 though, I'm not current. Logitech, well, the mk200 mouse + keyboard combo deal at $20 isn't bad, I've got a couple. Oh, and I love my collection of "mouse man" ergonomic wedge-shaped mice from the 90s. Bought a couple new and more used on eBay for parts since they're discontinued. All PS/2 though. And not designed to keep chips out.
