We did it...in the reverse order. I suggest you do it AS you are -save CN for last. You will love both resorts but do as much as you can at CTI then relax at CN. I would arrange transport via Couples and forget the puddle jumper flights. You WILL lose most of one day as you pack, travel and unpack BUT ask your driver to show you nice sights along the way.
Hoge, this is exactly what we're doing. We have booked 7 nights (to take advantage of the then-$500 spa/gift shop credit offer) at CTI, followed by 4 nights at CN. Obviously we would have loved to book a full 7 there as well, but hey, it's still 4 nights, and that's 4 nights better than hanging back at our house, dat's fo sho!
Reading is fundamental. It's just that for some, it's more mental than fun.