You could add a lot of strength in the lower pin area by making it a captured pin-a pin with supports on both ends. If the QH will fit between the square box and the pin then just a small piece of 1/4" with a 7/8" hole lined up with the existing hole, weld it on about 2" inside the other and get a pin that fits through both. You have a stronger pin area, and have solved your location problem.
I would definitely do what was necessary to make it fit--having a QH is just too handy.
Mike
I guess I dont quite get what you mean by making it a captured pin a pin with supports on both ends, could you draw me a diagram what your talking about? What sucks is im going off the HF dimensions, and the inside dimension of the blade hitch hookup is 28"