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I have an old ergo PS/2 keyboard I got from Goodwill for about $5. Surprisingly it's the best rubber dome keyboard I've ever owned and has become my daily driver.
I've built a few custom mechanical keyboards and while I love tactile switches, none of the keyboards were ready to be a daily driver. I need a full sized keyboard and it has to be split and tilted. But all the keyboards I've built have been small form factor. Self-inflicted problem I know and I'm working on building a full sized ergo mechanical keyboard.
A couple of the goals for this project:
The point of this project is to have an easily transportable keyboard that is decent enough to type on that has the fexibility of custom firmware and is usable in environments where USB is disabled.
QMK doesn't support outputting PS/2 which means we can't have a direct PS/2 connection and a passive adaptor won't work. Active adaptors seem to be hard to come by nowadays. There was an issue opened about adding support for PS/2 output but it was closed after it went stale. There is also a fork of QMK that supposedly supports PS/2 output but there is no documentation on this feature and it hasn't been updated in 3 years.
We're going to have to use a seprate board and build our own active converter.