I tried it and you *can* book an AP package room+dine even if there are no discounted AP rates out yet. You can use the WDW Passholder site (at the bottom, click to see more about the Dining Plans and a "book now" button comes up) or call. Then, you could book the room+dine now and your family could buy their tickets from
Undercover Tourist (at a discount) and everyone gets the best deal. When AP rates are released for POFQ, you could call and have the new rate applied.