@ady_e_n Presumably a low current DPDT switch. Since I have them anyway I'd be using a latching DPDT signal relay fired by two logic level mosfets controlled by two pins, hence emulating the switch itself with no running current. The relays I have are NEC EE2-3TNU around 7mm thick and 9mm tall, 5v version should be available if that is your logic voltage level. If space permits you could hot glue the relay to the board on it's side with the mosfets/resistors/3 pin control mounted onto it's base, hard wired to the original switch pads.