Okay, I have a cousin (who is WAY older then me, don't know how that it is he is technically a cousin) who flies a PA-32R, I'll see if he knows of old avionics shops where you can get one with a CRT. Especially an old navball if that is possible.
I think also that if people, say @zitronen and somebody who could help design a UI interface that RPM/ASET styled multipurpose interfaces but that would run on say a Pi, arduino, or a programmable microcontroller. this would run on say a CRT with Extra Immersion guaranteed. Using a USB keyboard HID you would have the buttons.