[Prezcatz]

If you are set on a deluxe, I think renting points will be a lot cheaper. You could do the split stay (and I would recommend it to help reduce costs), but as I understand it, you should not have to do 2 separate MYW packages. I thought you could buy the DDP for the length of your stay and only buy a 1-day ticket, because the DDP was tied to the nights of your stay, not your tickets.
Also, if you rent, realize the weekday nights (Sun - Thurs) are less points than weekend nights (Fri - Sat), so you could save some $$$ there as well, maybe do a value or moderate on the weekends and switch to the deluxe during the week. I don't know how many days you are planing to go into the parks, but you may want to look at APs as a cheaper alternative, which could get you some other discounts (AP rate for rooms, etc) as well.

Prezcatz Paul