I want to add a PS2 pcb to my 360 EX 2

Are there any special hoops I have to jump through, or can I simply solder the PCB to the microswitches and connect the grounds on both PCBs together? If anyone has already done this, I could use the help.

probably not.

Youd have to wire the pcb to the switches

I wasn’t sure if theres any voltage requirement differences between the two pcbs.

EX2/DOA4 stick is NOT a common ground. <understatement>This would be difficult </understatement> and require a separate circuit to be built with many analog switch ICs (or massive, and I mean MASSIVE, number of toggle switches.