Not so sure a prop shaft can ever be brought back to "true" in a shop without costing more than new.Additionally,I could never trust that shop trueing.
Also,pulling a bent shaft may damage bearings/bushings upon removal
Do repair correctly no matter what you're advised.
Sometimes I use a punch on threads to insure a nut doesn't walk itself loose.
I use grade 8 nuts and bolts on couplers that rotate along with some type of "Loctite".These can be drilled to receive a carter pin for never fail insurance!
All the Best