2 other options to consider:
#1-use the Melodyne Audio-to-Midi feature(assuming you on a recent version of PT and have some version of Melodyne 5 installed). For sure, there will be some "cleanup" to do, but it can convert audio to midi. If you duplicate the audio and chop up each track to remove all but the specific drum you want, that would help.
#2-Get Superior Drummer 3, which has a really good drum replacement feature. I dragged in the same stereo audio song file 3 times and set 1 to be kick, one to be snare and the 3rd to be hihat. Once it ran its analyze function, the results were shockingly good without any fussing(it would have taken some fussing to get a good final product, but all I needed was a drum beat without the other music that was baked into the audio file)
