Agree with the above that the first critical step in doing a split stay is to make two separate reservations at 11-months out at your home resort. That way, at 7 months out you can change one to a different resort if available, and if not available, you are assured of at least having your home resort for the entire time you want to be at WDW (and MS, upon request after 7-month window passes, will merge the two reservations into one). I also think that you should just avoid doing constant surveillance and single day changes if you cannot get what you want at 7-months out. Besides that it takes too much time, it also has chance of failing, leaving you with only one night at a different resort, and worse yet having that one night be the middle of the three you actually want. If you cannot get something you want at 7 months out, set up a wait list (or two) and see if you can get all nights that way.
You mention that you will be going "prime weeks." Reality is that Thanksgiving time is a super prime
DVC demand week when it will be difficult to switch at 7-months out, while any time in April, including the Easter weeks, is a more moderate DVC reservation time for which you will have some chance at 7-months out for BCV, BWV pool/garden view, or BLT lake view and, actually, a likely high chance if desire is 1BR in any one of those. BLT Theme Park view has less of a chance than lake view but a 1BR still has a chance. (Note, if you have not stayed in a BLT theme park view room before, be aware that floor you get for that view can make a huge difference. If you get 8th fl or above views are good, if you get fifth or sixth, you will likely feel you have been ripped off of those extra points required for theme park view because your main view will be of a parking lot and a monorail track; 7th floor is OK but not that great.If you get theme park view, make sure you put in a non-guaranteed request for high floor. I got stuck in a lower floor theme park room once and have never requested theme park view again.)
As to Thanksgiving time, a 2BR at CCV will likely be near impossible at 7-months out. At AKV, it depends. You mention AK SV but that could be a reference to either standard view or savanna view and you do not mention which AKV resort, Jambo or Kidani, although your reference to"dedicated" could be met only at Kidani. Jambo is extremely unlikely -- all 2BRs at Jambo are lock-offs and thus studio reservations can eliminate 2BRs. Standard view, even for a dedicated, at Kidani is also unlikely. Chances will be a little better if you are seeking a dedicated 2BR savanna view at Kidani.