Been playing with old hardware and needed PS/2 keyboard. Got (cheap) one from Amazoink didn't have a resistor which caused keyboard to be ignored.
So I made my own: wemos d1 mini, serves web site, captures all my keypresses and translates to PS/2 keyscans. Works _really well_!
I visit the URL from my desktop (captures all key presses) or phone (I configure buttons) and I can send any remote key presses. Websocket server on the wemos which is relaying the byte values for the scancodes. Now means I can use whatever keyboard I like.