Just for what it's worth. Cranberries, like all other berries can simply be frozen. No special preparation, just toss 'em in the freezer. Unlike other berries though, the thawed cranberries are indistinguishable from fresh berries.
How do you make your crusts Churl? I do all butter but with an added 1/4 cup of freshly rendered lard.
I'd never considered a Cranberry pie, and don't really know if I'd make one. But adding a few cranberries to an apple pie might be interesting. I like my strawberry pies on a cookie crust.

Good coffee, good weed, and time on my hands...