well, converting drumtracks to MIDI for blending or replacing with samples is some kind of an industry standard and there are many ways to do that.
I used Drumagog since day one for that
Since a couple of years Drumagog seems to be dead and I am using Slate Trigger anyway
you can create hitpoints and convert them to midi like described above
there are a couple or other solutions out there which can do the trick more or less good, Addictive Drums or SPL Drumxchanger etc…
All of these methods need quite some manual editing. Hitpoints are not very precise usually, maybe on a for on the floor scenario… but with fast drumming, fast doublebass, fast and sloppy played tomfills, snarerolls etc you will spend quite a while carefully editing the MIdi tracks… Slate Trigger gives IMHO the best results, Hitpoints are not sample precise enough for me when it comes to phase consistent blending… It takes usually about a day to convert all drumtracks of an album to midi… kick, snare, toms… Kick is usually done quite fast, toms are nasty so I usually do not create midi here - because I like a natural sounding mix anyway - but this is not point of discussion.