The UK maintains what it claims to be the largest collection/genetic resource of apples in the world (1882 varieties of apple, 93 of cider apple and 65 of crabapple) at the National Fruit Collection at Brogdale in Kent.  Its crab apples include a "Niedzwetzkyana Derivative", but I saw no trace of the Malus sieversii.

Also 39 varieties of vine (which isn't bad considering we're not really grape-growing territory).