See if you can't pop the coupler off of the drive. If you can, then you should be able to pull the snout straight up, and slide the rotors out. Otherwise you will surely not be able to slide the rotors / snout off together without hitting anything. I have never swapped rotors with the s/c on the car, but I would think this would work.

Otherwise, you could have removed the alt. bracket in the time it took to make this post. Good luck.