Cleric.
Add a brown robe. Shave off a patch of his hair. Arm him with a staff and two weapon fighting. Whats that? Enlarge? Ooooh! Whats that, Enlarge, bulls strength, holy weapon?
He's a monk. So what if he isn't a fist-flying arse-kicking (relatively, anyway) monk? He's a monk. A staff isn't...