Hey JB;
You should be able to find a switch from an electric-start snowmobile, if the original's gone from the SC, and you're right to use caution- the CDI box can make smoke if it's wired wrong. If I'm remembering right, the switch hooks up the same for the point ignition or CDI except that the CDI uses a single kill wire to ground and the point set uses two kill wires that connect together to shut down. All you need to do is find the one that is "extra" and ground it to frame for the changeover.
George- the Colt would have to have an in-line rectifier to make the headlights work, but I don't think they used a regulator, so it probably was no bigger than an in-line fuse.
Stuck in the seventies- not in the swamp.
(6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far