Seems like it. So far I've come up with this thought:
Team 1 (Ltab and Simon) does the rough collision fix, I will teach you how (will take an hour or so to learn it). Shouldn't take more than a couple of hours of fixing, and then probably a few hours of finding the remaining objects that needs this fix. Overall quite easy, though takes some time.
Team 2 would consist of Flat Face and I. FF would have the biggest job, as he would have to fix the stairs back into ramps, as well as chop up those objects which are over 2000 into >2000 polycount objects. My job would be to provide him with the objects' name that they are given ingame, as well as manually place these new objects.
Feedback appreciated.