Back a couple of years ago, to conserve points at the BWV we had a standard studio on the Saturday night that we arrived (two of our kids bunked with their aunt who also had a studio, two bunked with us). On Sunday we moved to a standard 2BR. We explained our situation to the CM at check in and she worked it out so that the next day, all we had to do was to go back to the front desk, turn in our keys and get new keys that opened up both sides. I suppose it depends on how crowded the resort is but this was on Presidents' Day weekend in February. So something like what you are talking about can be done.
HBC