Tom, I think you answered your own question. You may try to develop a new leader. Remove the broken top and take the next top branch and bind it in an upward position to the a 2 x 2 you have lashed to the trunk. After a period of time the branch should grow upright and become the new leader. That said, it may still look deformed and you may want to replace it. Best And Happy Yardening, Nancy.