Hi, a couple comments/questions:
1. What size unit at Beach Club are you waitlisted for?
2. You can NEVER predict whether the waitlist will come through or not, especially in high usage periods. You might get lucky--but have a backup plan in case it does not come through.
3. Consider booking the additional nights on a cash basis (if they are available) and cancelling the cash reservations when/if your points waitlist comes through. This will, at least, allow you to plan.