Thanks for the inputs. Yes I'm very aware of the danger.
We have a 20 ton manual, stationary hydraulic press at my job. Maybe I'll try somthing on that one. It presses very slowly and is easy to control.
But I'm afraid the bar will just "pop off" to one or the other side. Kind of like when you try to straighten a bent steel nail by lying it a flat surface with the bend up and hit it with a hammer. Very often the nail only twist to one side instead of being bent back.
It would have been better if I just found something to fasten the bar very good and use a long extention of some kind to make big force and bend it by hand.
But I also could make some kind of jig to lock the bar from twisting in that press...