Possibly cut a section out of the back, leaving the crimp alone. Tap out the dings and reweld the piece back on.... grind, filler as required, sand, paint.
The real problem is fixing the dents. Not as easy as you think. After tapping out, there is a lot of work to do. Filling, Sanding, polishing and polishing and polishing.
They are not overly expensive to buy new if all else fails.
