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(No experience other than what I've read on the internet.... caveate)
A fresh, simple bump in the middle of a large metal panel might be a viable candidate.
1). Heat the crease perimeter slightly from backside.
2). Heat the inner concave.
3). Apply dry ice to the center to rapidly shrink the sheet metal.
Or, no heat at all. I'd defer to what has been proven.
Haven't tried but worth a shot.
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