We used extra points for a long weekend AKL concierge(lots of extra points), it was fantastic and we will do it again, probably again and again.
I agree that you will sorely miss the two bedroom. We would only stay concierge there, or at any other resort...its the only thing that can make up for not having the full kitchen.
I still think that for a one time deal, to let the kids experience it and that the cost of concierge may be prohibitive, two rooms even more prohibitive, I would still do it. You can deal with it for two nights....Icome to think of it, you are going to get two rooms at AKL for your family, right? That won't be bad at all, concierge would atill be better, but two savanah view rooms would certainly be good.
We only have one kid.
It really will be a special experience for all. Make sure you eat at both the restatuants, maybe save Jiko for the adults.