This is a fascinating challenge, but I think if we strictly apply the under 6500 yard rule from the back tees we are going to end up with a motley quirk fest and not a list of substantial quality or great interest. I would alter the rules as follows:
"All courses under 6500 yards if played from the teeing ground nearest to the previous green."
This, of course, is how golf courses were originally designed, and how they were meant to be played. If you alter the rule to the above, all sorts of delightful choices become available, including places like Merion, Cypress Point, Dornoch, North Berwick, and NGLA.