I think I understand what you're looking for because I worked on a film where we had to do a shot like that.
I remember trying to make a rough camera rig, but we couldn't get the camera to turn exactly around a center point. That meant the shot ended up appearing like the camera was rolling down the hill in a barrel. Not good. ;-).
On the shoot I worked, post-production was a poor option because of the screen ratio. We were shooting widescreen, so rotating it in post required a massive zoom to prevent seeing the frame edges which, of course, made the picture fuzzy.
As I recall, the DP finally rented a Revolution lense (http://revolutionlens.econgo.com/) but that may be too expensive for your shoot.
I figure you could build a sort of Revolution lense yourself with a couple of mirrors and simple lenses (and some ingenuity). I've been meaning to work on something like that myself, but haven't found the time.
Good luck.
Dan Rahmel
Nuts and Bolts Filmmaking
http://www.cvisual.com