Perhaps @neondt or one of the other devs could weigh in if they're open to updating native councils. I know that they generally don't like to revisit paid content, but I think Conquest of Paradise is far enough in the past that the community will give them a pass here.
For the sake of making suggestions, feel free to think outside the box in terms of dlc locks. You never know what might find its way into the base game some day...