In the shop we’d always just use the DAG to straighten/unwillingly break a badly bent hanger, but do you have any thought on whether a big wrench is more or less likely to deform the thread interface? Perhaps a wrench would spare the threads but risk deforming the hole, and viceversa with the alignment tool?
If it's pretty badly bent but you still want to give it a try I'd rather disassemble the hanger and smack it carefully back to straight-ish position.
If it doesn't snap finish it with the tool or clean the thread with a tap, if needed.
In the shop we’d always just use the DAG to straighten/unwillingly break a badly bent hanger, but do you have any thought on whether a big wrench is more or less likely to deform the thread interface? Perhaps a wrench would spare the threads but risk deforming the hole, and viceversa with the alignment tool?