[X] separated Administrations- keeping the two together is impractical Ben Tre is in South Vietnam and Hoi An is in central Vietnam
Way too far away to rule jointly.
[X] Set up a garrison in each town, 10K strong. Demographics are to be 1K European, 9K locally raised troops, with positions higher up being open to loyal and proven local officers.
Room to expand if need be, and with us relying on locals, in theory cuts down on our footprint.
[X] For now, start off with power in the hands of Europeans, but steps will be taken overtime to transition into local hands. Such steps are not limited to taking on locals as staff and training them in the matters, as well as political classes for all who are interested. Service in the military we have will ensure you have better chances of being employed in the administration, but simply being a grunt for 3 years won't get you the top chair.