I've actually wondered about crab apples myself. I used to just eat them right off the tree in the fall...and my sister has a couple in her yard so when I see them I think "what can I cook those into?"
Your juice sounds very tasty...I might be tempted to add vodka. Or straight up for breakfast would be a nice wake up juice.
I think maybe a crab apple bread pudding might work. Of course I love bread pudding so I might be biased and off target. A little vanilla in it, too; maybe a touch of cinnamon or nutmeg. To me that sounds like it could work.
I found this link which has a couple crab apple bread recipes
Cooks.com - Recipes - Crabapple Bread
But I couldn't find any specific crab apple pudding or bread pudding so I would just add it to a bread pudding recipe that has fruit in it, like maybe sub crabbies for regular apples.
But I stumbled on this one and this sounds great to me since I love ricotta and the pears and apples, even crab apples, are a classic combo. Where do you live, anyway? ...if you make this I need to come over and taste it...please
crabapple pear ricotta pudding | How Did You Make That?