This is really quick and dirty, but I thought I'd share. I got most all of my info from this wikipedia entry, and personally know almost nothing about Khmer culture, and I wanted to put that right up front. Basically, I wanted an Asian possession tradition, and asked Synner for a recommendation (thanks!) and he pointed me toward this in a general way. If it sucks, blame me not him! Anyways...
Kru Khmae
Combat: Air
Detection: Guidance
Health: Plant
Illusion: Fire
Manipulation: Man
Drain: Charisma+Willpower
Note: Kru Khmae is a Possession Tradition.
There are strong ties in the tradition to herb lore, potions, and magical tattoos, as well as Hindu astrology for divination. Their theology is a mixture of Theraveda Buddhism, Hinduism, and a hedge witch-like shamanism, with ancestor worship.
Good metamagics for the path might be quickening (with magical tattoos), divination, channeling, and sensing. Enchanting has a strong tradition in this path, as well, particularly for healing and spirit-related foci.