Keyboard from 2010 built by TG3 for a Siemens chemistry analyzer. I cleaned it up, added some weight to the bottom, and converted to USB. Cherry MX Black and PBT Dye-subbed DCS caps. Take a peek at what should be F9 and F10 (and are after conversion), as well as some of the keys above the numpad, which, tangentially, now has 5 keys that do absolutely nothing related to what's written on them.
I'm only had to do this sort of thing with my Model F XTs (my AT works with a standard passive AT->ps/2 adapter->usb adapter). RP2040s weren't even a thing when I was playing with this stuff, but I don't doubt there are some great QoL improvements.