IF you were building a new control panel what button functions would you want on it ?? Cycle_start, M3,stop,etc,etc. I have been working with a Pi Pico to do simple hotkeys for PP. ANYTHING that has a hotkey inPP can be brought out to a buttons press.

The Pi Pico can do 26 single ended switches or a key matrix of 100s with a single Pi Pico.

Progam it then plu it into a usb port and away it goes. It is self booting so you never have to fool with it on power up.

(;-) TP