I am with littlefoot on this one. It is what it is. If the broken part matters then maybe you should have waited for another bull? What I am saying is; if it was good enough to shoot, then he is good as he is.
I have a badly broken Wyoming bull. I could not bring myself to fix him. I knew no matter what I did, the fixed part was fake. I had no idea for sure what was broke. Kind of like adding a cheater when he never had one? Maybe not that drastic, but you know what I am saying. Maybe you will put on a 13" point when it should really be 9"? You will never know for sure.
Be happy with what you have. Good luck whatever you decide. These are just my opinions.