I and others have been experimenting with Amelanchier for pear rootstock.
It is very dwarfing and quite precocious. It isn't perfect however as another grower has found that you should leave a shoot of amelanchier to grow as well as the pear scion as the rootstock just isn't that happy to have a pear on it. My own grafts just sat there for two years before finally showing some vigor this year.
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