Its a great idea but...

The primary dune environment is very harsh and most tree species will not survive on the dunes in OC. If you look at the vegitation on the primary dune on a more natural barrier island say Assateague you will not find any trees on the first dune. Trees are not usually found till at least the secondary dune system.

Since there is property on all of the OC coast it will be hard for the dunes to move, and a complete dune system to form.