So, I was looking around in the CK in the hopes that it would be an obvious fix for either getting the dremora to despawn properly or give it a hitbox so it can be dispatched, but unfortunately I couldn't figure it out...then again, I've never messed with modeling or hitboxes or even scripts in the past. So I guess I should not have gotten my hopes up.

Anyhoo, does anybody have any ideas about how we might make this happen?

It wouldn't be too big a deal but it occasionally goes hostile and can start rampaging on people at the college, breaking quest lines and can even bug out Ancano so that he also doesn't have a hitbox later in the game (how, I have no idea, but I witnessed it once).