No new info for you, sorry. My mechanic put mine on the hoist, took my wheel off, unbolted a panel and was able to access the rear quadrant. They heated the bumper and pushed out the indentation. Not perfect as you can see some small indents but less costly than replacing the bumper or looking at a large indentation.
It seems to me you are going to have to do the same, i.e. raise the car and remove the wheels to get at the panels at the very least.