The clerics of the tetragramaton (say that 4 times fast), arn't clerics in D&D terms. They don't heal, they don't pray (except to father, i suppose), and they certainly don't love their god, 'cause they don't love anything.
Monks, though. Monks are the clerics of the tetragramaton. You'd need different specials, all relating to gunkata.
Maybe give them a reflex save for half damage from bullets.
As well as sense emotion, which'd work like sense evil. That sort of thing.
But if you're just going for gunkata and not everything the clerics do ... i still say use a modified monk.