Vinnie:
I'll place my comments on each directly on your list:
But as to outside the box concepts:
1. 12 and 14 Hole Courses? - I have no problem with this idea, and in fact have designed a course which doesn't have any set number of holes [The Sheep Ranch]. I think the concept is way too outside the box for most clients, and is best used only when the land to complete an 18-hole course is unavailable or just completely inferior and would change the nature of the course. The Sheep Ranch did have more land inland to extend to 18 holes, and might go that direction someday ... but for now, why would they bother?
2. 18 Hole Courses Broken Into Distinct Sixes, As Opposed to Nines? - I have built courses which returned to the clubhouse at #7 (Pacific Dunes), #8 (both courses at Stonewall), and other holes. I don't think I've come back at the sixth yet. The newfound fascination with a potential 6-6-6 setup is, in my opinion, either a marketing gimmick or a sign of the devil.
3. Ridiculously short holes (45 - 75 yard holes) and ridiculously long ones (900-1000 yards)?
Personally I can't imagine the point of building a 50-yard hole, although I think 80-90 yards would be legitimate. I know of little historical justification for a hole of that length. But there is lots of justification for very long holes that might not be reachable in three shots -- Bernard Darwin's description of the old Royal Blackheath course makes it quite clear that one of the holes was in the neighborhood of 700 yards, even in the gutty ball era. I've only had one project where I've suggested a hole that long would be the best fit for the routing, and it has not been built yet -- possibly sparing me some ridicule!
4. Placing no card "par" for any of the individual 18 holes, just the holes yardage and an overall par of 72 = level fours?
You lost me at the overall par. Why bother with that if you're not going to have par for the individual holes? Why not just post the course rating and be done with it?
Which, if any, of these stands a meaningful chance to gain traction with designers and the golf they influence?
It's unlikely that any of the ideas you've listed will gain traction with mainstream designers, other than the 6-6-6, because who can deny the existence of the devil in modern golf architecture?
Many of these ideas have been explored somewhere, but whenever they are employed [very long holes, or the occasional course that's not 18 holes] it is treated as a marketing gimmick, and often one feels that's the real reason behind the choice. But, generally, golf design has become more and more conformist over time, not more inventive. There are always tons of people in the golf business who are happy to tell you you're crazy for doing anything out of the box.
Do you harbor any of your own that you would like to deploy sometime in your career?
I've built a bunch of courses with fescue fairways, despite being told how stupid it was. I've continued to build greens with severe contours, despite being told how stupid it is in light of greenkeeping "improvements". I've built courses with 80+ acres of fairway. At Old Macdonald we built a hole similar to the Alps at National, which I'd been told for years that "no one would ever build today". And I've put so many bunkers inside fairways [partly by widening the fairways] that no one even comments on it anymore.
I've suggested designs with cross-over holes, and we are building one of them right now in New Zealand. I'd love to build the second course at Black Mesa with the 700-yard par-6. I'd love to build a reversible course that succeeds. But all of those things need the right client and the right piece of ground where they really are the best solution to the problem, before I'm going to employ them.
In spite of what others think, I don't exist to be controversial. I try to find the best possible solution to placing my golf holes, and that seems to include a lot more options for me than for most designers, because I don't have as many design taboos. I don't seek to find exotic solutions for their own sake; I'm just not afraid to use them when they really make sense.