SSR is the largest
DVC resort. It has more dedicated 2 bedroom villas (360) than any other DVC resort. It also has 432 lock off 2 bedroom villas (those can be booked as separate studios and 1 Bedrooms or as a 2 bedroom). SSR 2 bedrooms will be available well after the 11 month window opens.
Even if you decide to book all 10 nights at THV to make sure you get the THV nights you actually need, there is virtually no chance that all the 2 bedrooms will be gone by waiting a week or so to book the 2 bedroom.
Just get the THV reservation, then drop the first 5 nights (keeping the last 5 as you want) and book the first 5 in a 2 bedroom. That's the best way to end up with what you say you want. Really, if you get the THV reservation, you'll be just fine.