Yes.
DVC members can add the
DDP to stays reserved using points. Just let MS know you want the plan at least 3 days before arrival and they can add it to your reservation. You will pay for the dining plan at arrival. It will be added for all guests registered for the stay for the entire length of the stay and will be encoded on the room keys just like at any WDW resort.
You can add Magical Express the same way by calling MS - except that there is no charge.
Enjoy!