medium or thick CA, Fiberglass or epoxy it. After it dries, recover that area with some monocote or medium temp covering. It might knock the ballance off a bit, but certainly no more than the pins you already used. I'd put a strip of covering over it at least 1 1/2 inches on either side of the break ... just to help it hold better.
Something else you might try is like 3/32" or 1/4" dowels.