No way around this one. Even a contract agreeing to write a future contract is viewed as circumventing the HUD flip rule.
Besides, too much can happen...why would you want to? Job loss, change in credit rating, changes in lending regulations, changes in value....
Find a sharp agent, I don't know anything that states you can't "advertise" the HUD contract availability date, which will bring with it an $XXXX price bump.