Yeah it doesn't seem wise to disassemble it given the pin and the fragile joint. Going with the glue seems like the best shot. Just try to practice with the glue a bit before trying. Also see about covering up with thick masking tape the joint area so that if there is an accident, it doesn't spill on the plastic itself.

In the unfortunate event that it does break off completely, I would recommend pulling the pin out then and try to loosen up the joint. That way once you glue the piece back, it won't have anywhere as much friction and be less stressful on the plastic.

How did it happen anyways? First time I hear of this. I know this used to be a problem with G1 Hook.