Hmm, I'm curious what you come up with, let us know! Here's my suggestion...
Wet road, shoot car going into a slide (this is dangerous, have a supervisor and medical avail on standby). Shoot a plate w/ camera move from say 90deg to the left (as if looking from passenger to driver) to full forward and quick tilt down (ie POV pass to driver as car skids sideways and then rolls over). Shoot in-car of driver w/ greenscreen and key in camera plate of rollover beginning.
Shoot a model at high speed (frame rate dep. on model scale) of a model performing same rollover. This could be shot overhead and matted by roto or GS to an "aerial shot" like what you'd get from a helicopter once you key in the plate of the roadway or something that looks close to the area you're shooting in. And finally, if possible, rent a junker from a junk yard and have crew rock the junker to shoot the "landing" or "rolling end" w/ talent inside the car. You should only need the cab for this, no engine or anything else.
This should give you atleast a 4shot sequence to use.
Anyways, that was my penny's worth. Let us know how you finally do the shot, curious to see what you come up with...