I don't go back to audio as I am happy enough with the VST drums sounds as it is. The drummer we had back then had a terrible sounding kit anyways. And his timing was far from perfect. He's long gone so will never know :)
But if you did want to revert back you can use the original drum audio and turn it into samples. Slice it into a short snippet in a wave editor. Put it in Superior Drummer or any sample player and trigger that.
I sampled my acoustic drum kit and it's kinda cool to play it as a VST..
Working with an audio drum track fixing timing seems an endless chore, it can be done and a lot depends on the leakage between the mikes.
Real hard to work with overheads. If your kick leaked into them and you correct the kick mike track you'll still hear the original timing in the overheads.
So now the work starts!
My solution was I isolated all the Tom rolls and managed to use drum replacer to turn them into midi. I had to manually set each note, drum replacer made them all 1 note.
Then I just cheated and replayed the Hi Hat and cymbals using my Yamaha DX Kit.
End result was a close approximation of the original but lacks all the audio voodoo. But once put in a song with all the other stuff you don't notice so much.
So you sacrifice realizim for better timming which on certain songs is an improvment.