Wonder if it would be possible to have a real drummer play a section several times over but each time using only one part of his drum kit and hitting the rest in the air (like playing air drums)to eliminate the bleeding problem.

He or she could follow a headphone recording of their full kit playing as a guide.

Or could individual Realdrum sounds be sampled and then synced to a midi signal as opposed to a synthesized midi drum sound or are those programs probably already available?.
Just some ideas.

Carkins