I would use 20, 28, 50, 85, 135, and well 200, because that is the issue, you can not always predict the spot and often the 200 is perfect for the unobtrusive shot from the back of the church looking up to the bride and the groom.
I sometimes do non primary bridal shooting, and guess I would recommend two bodies with zooms; one wide to mid, and second mid to zoom.
so, sure can do the Primes, but you have to really really plan your location/lens if you are limiting yourself to just two lens,
If I had to pick two, guess it would be 28 and 85.