I was reading a bit more on rentals since my post above and see that there is some flexibility in renting that wasn’t there when I made multiple rental reservations for a large group some time ago. Specifically, the board sponsor has a “stress free cancellation policy” that appears to make cancellation of a reservation somewhat less painful with a rental:
https://dvcrentalstore.com/guests/cancellation/
Hotel reservations would still be more flexible, but the cost savings with a rental may be worth the extra planning required.
Good skills with your trip planning!