AKL concierge can often be fully booked very early during the 11 month window; in other words even owners often need to act quickly to get it at 11 months out. You need a lot of luck for 7 months out.
Based on comments above, you need to be aware of something else you will not be able to do at 7 months out. You will not be able to have a BLT booking for your entire trip and then change it at 7 months out to switch a couple nights in the middle of your trip to AKV. You will only be able to switch successive nights either at the beginning of your trip or end of it. It works as follows: assume you book 10 nights at BLT; at 7 months out you can cancel any successive nights at the beginning of that trip or at the end of the trip and book AKV for those canceled nights if it is available at 7 months out, e.g., you could change the first two nights of your 10 night trip to AKV or last two nights. However, they will not allow you to just cancel BLT for a couple nights in the middle of your trip and change them to AKV. For example, suppose you have that 10 night BLT reservation and can get nights 6 and 7 at AKV at 7 months out. The only way you can change your BLT reservation to do that is to cancel all nights 1 through 7 or, alternatively, all nights 6 through 10.