As others have said, I'm sure you could work something out with the hotel, especially if you are going to use some of the nights. However, it just seems like a huge waste of money.
If you are worried about requalifying, I would recommend getting the Premier Visa where you get 15 qualifying nights, a free night (Cat 4 first year, Cat 5 thereafter), and, I think, bonus points (not sure on that one). All for $75 or so a year.