I haven't played Kapalua, but I've played plenty of courses on hilly terraine, and I've got to say that the concept of #6 does not seem that difficult to replicate on the right piece of land -- and Maui is not the only landform in the world where such can be found.
I think architects are more likely to use steep drop-offs like the one behind this green for a drop-shot par 3, rather than risk the wrath of golfers who overshoot this green as a par 4 and lose their ball in the jungle. Personally, I'd love to see more holes like this, and I think almost anywhere you find hills (or mountains), you could do it -- presuming you could convince the course owner to go along with the idea.