Is Improved Natural Attack (unarmed strike) legal? That would give it a 3d6 unarmed strike. I'd also think Lightning Reflexes and Deflect Arrows would be good picks.
As for the skills, increasing Balance, Hide, Listen, Move Silently, Spot, Tumble would be my preference - 5 more in Balance, 7 more in each of the others?
As for the Ability increases, I'm thinking +2 Dex and +1 Wisdom is the most effective pick, although there is something to be said for +3 Wisdom.
I notice it's missing some of a 10th level monk's SQs. I can understand cutting its Purity of Body and Still Mind, since it's already immune to disease and mind-affecting attacks, but there's nothing to stop it using the healing from Wholeness of Body.
Hmm...I was assuming it was positive energy (and therefore harmful to the sea abbot), but it isn't spelled out. Odd. I'll add it and leave it up to the DM to fight the contradiction.