I think that you need to take a look at
this thread. I don't think that you have realistic expectations when it comes to VGF. Studios at VGF are hard to book most of the year but they are extremely tough for even VGF owners to snag during late Nov. - all of Dec. bobbiwoz owns at VGF and can't even book a studio there for themselves in December. If the brokers won't even try to line up an owner until the day that the booking window opens (or at best, the day prior), then you are already at a disadvantage if you work through one of them.
You could get lucky but while you're seeking those 2 studios at VGF, you may miss out on the opportunity to book the 2-bedroom at BLT that you consider to be your back-up. Keep in mind that only those with points at either of those resorts can book their home resort at 11 months out. If you go with a private rental, having a BLT owner lined up won't help with getting two studios at VGF and conversely, having a VGF owner lined up won't help you with booking a 2-bedroom at BLT.