Even if they are pre-wired... what did you conclude on the switching? It may be too much hassle to use the pre-wiring and just do your own. The key, IMHO, would be attachment conditions... is there a place to physically attach the fog light?

Also, the notion of something in the way preventing you from getting to the bumper... its a simple plastic skirt. Remove it and you should be able to get to it. This is a nice skirt, one that 1st gens didn't have - bonus because it will keep snow/mud/dirt from getting on your fog lights.

Keep investigating!!!