resin doesn't heat like you are talking about doing, you will only cause stress cracks if you try to bend it and you are more likely to damage something than fix it that way....
One way would be to use a dremel to cut a groove into the back of the piece, through the fiberglass, very careful not to go through to the out side, this will give it a place to bend and not crack, bend it and use something to hold it in place (tape?) while you apply a fiber glass patch the spot you grooved...