I made almost all these things last year! I took two months to decompress leaving my last job and went on a foraging spree! I did crab apple membrillo (like quince paste, with a flavour somewhere between cranberry sauce and quince paste), smoked crab apple chutney, pickles, and my absolute favourite, crab apple and rose hip jelly. It has the most amazing silky texture. Keep at it!
The pic is just some of my haul from last year in the UK - 3 different types of crab apples, wild apples, sloe berries, and rose hips.