We lived in the area for about 10 years broken up over 3 stays. I worked in Wilmington 5 days a week for 3 years and eventually just a few days commuting. During that 10 years we lived on Topsail Island for 7 years and in Holly Ridge for 3 years. I have worked all up and down the different barrier islands in NC and VA.
Some native tribes did live on a few barrier islands but most lived on the mainland at used the islands for resource gathering. If you have had a chance to spend time on them, there are just a few thriving native species of vegetation and if it was not for the bulldozers, the islands would be constantly built up with complex dunes that would get washed out during hurricanes and on the cycle goes. They used to be great resources for seafood, especially in the intercoastal waterway.
The preserved areas of the OBX are a good place to see this. Ft. Fisher is a closer preserved area where you would get the idea of what things would look like without all of the "beach nourishment" programs.
When we were first on Topsail, it still had a lot of remnants of a fishing community with about 1/3 of the houses being cottage style. Now it is a lot of new construction pushing whatever max elevation height the towns decide on. Huge 4 story beach rental homes everywhere. Oak island and Harkers island along with a handful of others are still mostly low key with a lot of local full time residents. That is changing though.
My opinion is that if the towns/state/federal did not spend millions a year on "beach nourishment", most everything you see on most of the barrier islands would be gone after 2 moderate hurricanes.
Equally problematic is that if you go too far off of the coast or too far away from more developed areas, be wary of existing or possible poultry and hog houses. NC is very friendly towards these type of feeding operations so long as they do not interfere with the coastal tourism income. It could be a nightmare to buy some rural property and not know about or have a future feeding operation come in close to you.
I would recommend looking up Dave at Changing Ways Farm. He is a retired USMC pilot, great guy, regenerative farmer. We got our food from him when we started to become educated on conventional farming practices and looked to find regenerative practices.
https://www.changinways.com/
Looking forward to any updates you post!