Oh man. That's terrible, but thanks for sharing! So, how about putting the car in gear? Not a habit?
My dad did the same thing with the family car when I grew up. Backwards roll as well. At the bottom of the hill was a big pear tree. To fix it, we drilled a hole in the center of the dent. Put a big piece of steel bar stock inside the trunk and a chain to the pear tree. Put it in first and off we went for working out the dent with many small drives forward until the chain stopped the car, pulling the dent out. Worked pretty well. I thought it was fun how the pear tree was part in both the accident and the repair!
I am with everyone else. Buy back and fix. I would also check how tweaked the tub really is. There is likely a grey zone between what the body shop considers needing fixing and what is still drivable with a creative alignment.
G