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Weather was good on the weekend so I finally got around to doing my interspecies grafting experiments. Cut down three large and two small hawthorns, and rind grafted a mixture of pears (Stinking Bishop, Bastard Sack, Green Pear of Yair, Judge Amphlett & Black Pear of Worcester). No idea if they will be compatible, I know that only some pears can be grafted successfully onto the much more closely related quince roots. It is supposedly possible to do and I've seen pictures purporting to be pears on hawthorn roots.
I also grafted some Whitty Pears (sorbus domestica), but whether these will survive is even more doubtful.