I think 6 to 5 wouldn't be challenging relative to some of the others (although it would involve considerable property risk to the cottage of a certain one-time GCA poster).
For my money, I still think 15 to 14 would be next to impossible.
You have to throw out par, b/c some of the routes needed to be taken are absurd. Like, for example, 12 to 11 green.
I think you would need to
1) go down 12 fairway
2) lay up onto 7 in from of the HHA
3) play your next shot down to the bottom of the hill on 8 fairway, and lastly
4) lob it up to 11 green.
I guess conceivably you could skip step 2 and take it over the halfway house down 8 fairway.
Funny that 16 to 15 would play almost identically to the 15 in normal direction, with the exception of the tee shot angle ( the smart play being to lob your tee shot over to 15 fairway, instead of going back up 16).
Some of this seems impossible, but pretty darn fun to think of all the routes.