I haven't bent one yet but it's always on my mind when i'm working around trees, buildings or other obstacles.
I don't know what other machinery you have on the job but I've wondered if it would work to place on excavator/backhoe bucket at the outside radius of the bend then use a come along, chain hoist, porta power ram or anything else that works to pull from the top of the mast back to the hoe dipper stick??? Maybe even another hoe with a careful operator and someone eyeballing the mast???
I assume by now you've straightened it back out. how did you do it?