My "final" mod to the lift bridge controls. I added the two switches in parallel, they work great. I used cable grommets and drilled a 1 1/2" hole in the fascia and bonded my fiberglass mounting plate behind the fascia. Neat, and since it's a friction fit, I can even remove the grommet to seal the fascia, a step I need to do after any other possible mods to it are made.
Remaining was the remote possibility that some pair of characters would try to activate both switches in opposition and short things out, probably not likely, but then not impossible either. So, I addressed that eventuality with this wiring mod, an 3.7A PTC is in series with one of the hot wires. Excess current will trip the PTC until whatever yahoo that's holding the switch lets it go. 
