I'll assume you do not have enough points to hold your existing reservation while you book BCV and waitlist the missing night(s). I'll also assume you want 6 nights, with a check in on 1/30 and check out on 2/5, and do not want to borrow.
If it were me and I really wanted BCV, I'd modify the existing home resort reservation to book the first four nights that I can get at BCV right now. Then I'd go back and make a two night reservation at my home resort. So the worst case is I end up with a split stay.
When the window opens for 2/3 and if it's still not available (likely), I'd put in a two night waitlist for the last two nights (2/3 & 2/4) and indicate that I want to replace the 2 night reservation at my home resort if it comes through.
Your chances of getting a 2 night waitlist are not as good as getting two individual single night waitlists, but then you risk ending up with a hole in the middle and having to move back and forth. Only you can decide how much of a gamble you are willing to take. IMO, unless the first weekend in February ends up to be a race weekend, you have a good chance of having waitlists work.
Good luck!