Would you consider the use of an anabolic agent to promote fracture healing?  

While there are no drugs FDA that are approved to enhance fracture healing, there is considerable literature and experience using the PTH-based anabolic drugs to attempt to heal a fracture. They are sometimes used in the setting of delayed union or non-union. They have been used in elite athletes to...

You hit all the important points, with cost and consequent insurance approval always the greatest obstacle!