I wasn't aware that the Monk class ever had divine spellcasting. In what edition were they divine spellcasters?
You cannot make a Zen Archer Monk chaotic. Monks must be lawful in alignment to represent the stringent training and discipline they undergo to achieve their physical prowess as taught to them by a sensei.
Really, the only way I see this background making any sense is if the old man from the woods is a monk.