I agree that going an out and out 442 wouldn't work, not with Scholes in there, but you could get Rooney to drop in to the middle and I mean properly drop, not teeter on the edge of the hole/striker. He would offer so much more than Park. Not to mention Welbeck as an out ball is better than Rooney. Rooney is good leading the line when we have the ball lots, but when we're under pressure he's not so good. Welbeck however has the physique and pace to cause real problems, not to mention the awareness and ability to hold it up for people and play others in. Or you could put Young there and tell him to drop back.
Sure we were missing some good options in Fletcher and clev/ando but i think we could have gone differently today. Especially considering they played both Tevez and Aguero. Toure and Barry as a combo aren't that much stronger than Carrick and Scholes that it would have been such an issue, and I think having Rooney on Barry would have given City a bit more to worry about then Park.