FWIW, I have bent Riflescope Hoods back in to shape with Sturdy needle nose pliers where the jaws were wrapped with several layers of Gaffer tape.
Just go slow, Just a little at the time.
When properly wrapped, The jaws should have a round profile.
That allows you to work gently at one area at the time, Restoring the original Radius of the hood little by little.
Start Clockwise and go just a little, making several passes so as to not overwork the metal.