You might enjoy this thread Recommendations for Cold Hardy Pears, Zone 4 and this one Rootstock for Ure, Golden Spice and Early Gold pear - #2 by clarkinks and this one Early cold-hardy pear varieties? and this one Krazulya Pear - #2 by clarkinks and this one Russian pears for zone 2 - some info I found . @Bernie @hungryfrozencanuck4b from Canada are familiar with russian pears in zone 4 as there may be additional options now. I would also consider contacting Bob Purvis https://purvisnurseryandorchard.weebly.com/ . I have not spoke with Bob in a couple of years but he’s very good with cold climate orchards Bob Purvis Scions eg. Giffard pear was mentioned as a great pear for Alaska https://www.apfga.org/giffard-a-pear-for-alaska/
Alaska fruit growers mention several pears here Alaska Fruit Trees - Pears
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