Here is my idea for an elementary 2 speed fan control module.
Concept is simple and would utilize the factory Contour wiring - I have a relay base that will accept 2 relays that I picked up at the U-pullit for $3. I will take an exterior gang box and make and opening in the top edge for the actual relays to access the base, mount the relay base, circuit breakers and terminal block inside the box. Mount the box close to the fan, wire it up and put the cover on. The actual relays are exposed at the top of the box but everything else is weather proof. I dont think the relays being exposed will matter much but if so it wont be too difficult to fabricate a cover for them.
I know the drawing is cheezy but does anyone see a reason it wouldn't work?