Umm...probably just be a monk?
It's doubtful that monks will go non-hostile to PCs. Once this gets completed the Monks in Thay will probably be changed to just generic monks anyway. I recently took out lycans and vampires going non-hostile to PCs not only because PCs would attack them anyway, but because not every lycan/vampire is going to be friendly with other lycan/vampires - just like not every cleric/druid/fighter/elf/human you meet is not necessarily going to be friendly to a PC with the same corresponding class/race.
It's doubtful that monks will go non-hostile to PCs. Once this gets completed the Monks in Thay will probably be changed to just generic monks anyway. I recently took out lycans and vampires going non-hostile to PCs not only because PCs would attack them anyway, but because not every lycan/vampire is going to be friendly with other lycan/vampires - just like not every cleric/druid/fighter/elf/human you meet is not necessarily going to be friendly to a PC with the same corresponding class/race.