Last time this was discussed it was determined the no-fly stuff was based on commercial aircraft, which is typically designed to have a maximum pressurization altitude of 8,000 feet. They do this slower than the actual change in altitude. If your plane loses cabin pressure at 29,000 feet, well this is not covered by the DAN guidelines.
I'm pretty sure saddle road in Hawaii, between Kona and Hilo, is at about the same elevation that a commercial airplane to pressurized to, about 7 to 8 thousand feet. So if you hopped out the the water at the Kona marina after a couple days of diving and drove directly towards Hilo this might be bad. If for some reason you decided to drive to the the observatory at 13.000 feet instead this would probably increase your chance of a bad day somewhat. How big a chance of something bad happening I don't know, it probably depends on a bunch of things about you and your dive profile.
I normally dive dive at a site at about 4600 feet and an hour towards Albuquerque there is a ridge that rises to 7000 feet. I don't personally know of anyone who has had a problem here, but I've heard that people have occasionally (rarely) managed to find themselves in some trouble if they work hard to immediately leave and drive fast to there. The normal rule of thumb was to wait around in town for about two hours, having lunch and putting gear away, before driving back to Albuquerque.