takes a lot of practice--lots. Timing, ability to read defenses by the QB, and perfection of instantaneous execution is absolutely necessary. If he can't get his defense prepared to defend against the option, he certainly can't get his offense changed up to execute it anywhere close to acceptable.
He should stick with the horse that brought him to the bowl, as lame as it might be. That means he should spend his time trying to practice and perfect his own offense and not try to change to Navy's which, of all the offenses, probably takes the most practice to execute successfully.