the consequences should be highlighted as westy does not have any real safe zones once you are in the canyon....as said, be prepared for a long, dangerous swim, one that no one would like to entertain doing.
Safety behind the rafts is good so long as the other kayakers you are paddling with are solid and can manage themselves, otherwise three kayaks is hard to regulate especially since the rafts will be moving fast.
If you are psyched, bring your boat and camp around little D. If that rapid and the eddies above freak you out, you can always put your boat on the raft for the bigger water.
Be prepared, last year we did a trip at about 13,000 and had two gear boats, paddle raft and some kayaks. The paddle boat flipped in Skull and that alone was enough to manage with swimmers getting away from the rock of shock.....
Be smart so you can do Westwater again at a lower level.