The only “backroad” into the OBX would be driving down the beach from Sandbridge, Virginia to Corolla and the Park Service would probably intercept you. Then, there’s the border fence to keep the wild horses in NC out of Virginia.
You’re not getting onto those islands as a visitor without a boat, in other words. There are two bridges from the mainland into Dare County. One public ferry. That’s it.
My grandfather was a moonshiner back in the 30s.
My dad taught me the back roads.