I have spent sooo much time, weeks on end trying n buying software to do this, my eyes are red sore from staring n reading, dragging drum files into apps.
I will keep trying but I think at the end of the day unless you are willing to sit down and manually correct the beats, it might be easier and quicker just getting a good Drummer with a good ear to come in (or better still send them to him/her to do at home in their own time) and listen to each wav and play n record it on a midi kit.
Maybe only if you need to, after in Reaper you can automatically put markers on the transients of the wav then snap midi to markers to try and have the timing identical to the org wav ?

I think you said the original recordings just had a few mics, but I suppose they were recorded straight to a stereo track ? no hard drives out the back with with multitrack recordings you can trigger from ?

Any new Drums just record em multitrack n have some triggers on them to get the midi also.

Anyone else got any ideas ? crazy