Whenever I drive through NJ, I always try to stop at a nursery to see if they have any pitch pine, but I suppose since they grow there, there is not much impetus to sell them there. I guess I am barking up the wrong tree, or budding up the wrong bark or something.
Seems to be great material, but as mentioned, tough to collect in sand. It is possible that if the water level was high it could keep the roots shallower. I'm not sure that they would grow in a boggy area, but worth a check if you have access and permission. In a standard sandy area you could try to prep a few years out by adding in some organic material like spaghnum or peat, and maybe a little rooting hormone back in around the trunk if you find the roots extending forever downward.
Or since these are so adept at throwing adventitious buds, maybe they would be more susceptible to air layering than your standard pine?
These are musings, rather than advice based on experience, so take with a grain of fertilizer(salt).