If a split is doable, I think an AKL/CR would be a great split. We didn't think the AKL transportation was bad at all. The buses only go to AKL and Kidani, so there's no sharing with any other resort(s). AKL is kind of out away from everything, but since there are no other resorts involved, it doesn't take more than about 5 extra minutes to get around compared to other resorts.
You are correct about the
DDP and tickets. You would need a minimum 1 day base with each stay if you paid for the DDP and a 2 day base for FD. The extra tickets can be saved and used on a future trip, but that does add cost to the current trip.
As far as room size, unfortunately, the rooms at AKL are considerably smaller than the Poly and you will notice a difference.
I would do CR first since you do MK your first day and then will be doing MNSSHP the second day. I'm confused on your split day. Will you be checking out of CR on Wednesday and staying at AKL Wednesday-Sunday? If so, you would have to be checked out of the CR by 11:00 and your room at AKL might not be ready until later in the day, so not much time for sleeping in and enjoying the pool all day. Other than that, I think it looks good and you would get to try 2 new resorts

.