Huck,
Of course it wouldn't work, but us pundits love two-dimensional golf courses, do we not?
Can't you just see a nice right-hand bunker or two cut into the hillside about 30 yards short of the green that merely needs to be carried to feed a ball off the hillside (think tee shot at the 6th) and another beauty front left with just enough footpath below to circumvent the green from the 16th tee (isn't that what one has from the 17th tee around the 16th green?)
Looking at the Coastal Commission's web-site, there's a nice little flat spot just up from the 16th tee that would do the trick.
I think the real reason the Good Doctor didn't route the 18th this way is that nobody would ever have ventured out to play the first 15 - they'd merely play the 16th through 18th 6 times and call it a day.
Mike