Most likely I'll be using a 20 amp rocker switch as used on older, or aftermarket power window installations.

The XF spoiler switch has only two small wires coming from it.

The main thing, will this schematic work?

I was concerned about the Ground Distribution comment. But it turns out to be a simple raised piece of plastic on the outer edge of the gear which pushes the metal piece in on each of the switches to ground it - thus stopping the motor.