My plan was to just tear the sheeting off, cut the rafters at the top plate and winch each rafter into its NEW Correct place after I square the walls up.
If I understand correctly and the overhang is uniform, the trusses are already correctly connected to the top plates. I would try squaring the structure with the sheathing in place. If it doesn't work, you haven't wasted any effort because the same method could be used with the required amount of sheathing removed.
I would tie cables with turnbuckles to the top plate at the center of the wall that is bowed out to both corners of the opposite wall. The cable connection points might need to be reinforced depending on the existing construction details. Tighten the turnbuckles slowly over a period of days or weeks as required. A bow of 5" in 32' isn't very much. If the structure doesn't straighten uniformly, additional cables might be required at other locations along the bowed wall. A wood framed structure can be very flexible in a plane that doesn't have diagonal or solid bracing.
When the structure is satisfactorily square, the cables could remain or some other type of bracing would need to be provided.