Pulling straight from Franklin Covey’s seven habits: think win-win. Simply allowing people to cross at the corner and encouraging them to do so by building a path works keeps them off his land and in public areas. Hell even charge them a reasonable fee for the crossing to keep it from becoming a free for all!
But the no compromise, ‘7 million airspace violation’ position will lose badly in the long term, even if he can convince if he can convince a few local juries for a few short sighted temporary wins. Worst case scenario is the federal government decides that there has to be land access and forces a road onto his private property. Now _that_ would suck.