The course doesn't have to be removed from the rota to be preserved. All you have to do is:
1) Keep the greens at normal, year round speed if there really aren't enough pin positions
2) Forget about par. Par is an arbitrary number; it means nothing. If the winner shoots -20 (which, if there is wind, won't happen) so what? The player that played the best won, aka the tournament was successful.
Or if they are that wedded to par, play it as a par 70. The 5th is par 4 for all pros anyway, while with the new tee 14 is still a legitimate 5. #9 can be the first >300 yard hole in championship golf. No one will shoot 20 under on that layout.