O22 and 5132 Switches

For the switches, you'll want SPDT center-off spring loaded switches.

You can run the wire inside the switch right past the cover on O22 or 5132/3 switches and just connect to the existing connections inside the cover.  You don't really need the ground wire, just ground all the SPDT switches at the panel to the common ground.  You'll just have to connect to the outside terminals.

For really invisible wire, you can also drill a hole in the base of the switch motor, but that seems a bit extreme.

Since the terminals are still going to stick out, is totally hiding the wire really that necessary?  You're making it a lot harder to remove a switch if you have to do some maintenance on it.

Thanks for the quick response.