I was a little concerned about that too. I just lightly pulsed them in the food processor, and didn't get much breakage of the pits. When I racked it to the secondary, not much came through the racking cane, and I didn't have any blockage issues, during the transfer.
On Deck - Crabapple Wine
Secondary - Pomegranate Wine, Red Table Wine, Wild Fox Grape Wine, Blueberry Wine, Surly Furious clone
Bulk Aging - Brewtopia Barleywine, Sugar Beet Wine