Ah, found something quick for the monk in Complete Mage. I just switch necrotic energy for positive energy and we get...
Dathwarp Strike
The traditional monk seeks balance in body, mind, and soul, and through this equilibrium gains various combat talents. A lightbringer monk who learns the secret of the deathwarp strike masters a divine talent of channeling positive energy that disrupts the ki of undead creatures, producing an effect akin to terrible sickness.
Class: Monk
Level: 1st
Replaces: 1st level bonus feat.
Benefit: You know how to channel positive energy into your unarmed strikes. You must declare that you are using this ability before you make your attack roll (thus, a failed attack roll ruins the attempt). In addition of increasing your normal unarmed damage by 1 step (from d6 to d8, d8 to d10, and so on), your unarmed strike renders any undead creature nauseated for 1 round, or sickened for 1 round if it succeeds on a Willpower save (DC 10 + 1/2 your monk levels + your Wisdom modifier).
You can use this ability a number of times per day equal to your monk level, and no more than once per round.
Given how Pathfinder works, perhaps I should reword this a bit to make it part of Stunning Fist, saying that your stunning fist can be used on undead creatures that way? Edit: Nope, your Zen Archer replaces Stunning Fist with Perfect Strike, so I might as well leave it as is...