I think the best way for Michigan to get to or closer to 85 total scholarships with this class is to convert some current recruits into preferred walk-ons. Oversigning by three won't do anything to help the overall numbers because you still have to be at 25 when fall practice starts. Similarly running off some current commitments might increase the average star rating of the class, but doesn't do anything to address the overall scholarship number, and burns recruiting bridges.
So I think the coaches need to identify recruits--Vinopal? Murphy and/or Grimes? Mehrer? Maybe even R. Miller, since he's here already and as loyal blue as one can be-- who are willing to wait until fall to get their scholarship, and promise them it'll be there waiting for them. This would be better than the deal Brian Griese got, even though his was pretty sure-fire, because the scholarships are actually available right now. They wouldn't have to have someone leave for them to get it. The downside for UM is the player remains free to accept a 'ship elsewhere up until he enrolls in the fall. The biggest downside for the player(s) is, I think, freshman walk-ons may not be able to join the team until school starts, so they'd be a bit behind.