Well if he has a good enough Wis, then the ranged cleric at-will powers are on the table -- I think Sacred Flame's temp hp or save probably wins over Lance of Faith's attack bonus. Commander's Strike doesn't require an attack roll, and he could use it when he is stuck in melee (though he probably won't have an Int bonus for the damage) to give someone else a crack at the monster. If he wants a decent melee option that he might use once and awhile, he could grab a rogue at-will and use a light blade in melee. If he uses a crossbow instead of a longbow, then ranged rogue at-wills are on the table.
Cloud of Daggers might miss all the time (since he won't have a good Int or invest in a decent wizard implement), but then the effect stays in place and does Wis damage to creatures starting their turn in the square or entering it. This is my most creative idea of the bunch.