Question the History of a pear or know some history? Post it here!

Hello pear experts:
I volunteer at the High Plains Environmental Center in Loveland, CO. We have an heirloom fruit orchard. It is approximately 10 years old. To date, there have been no pears planted. However, we have lost a few apples and cherries, opening up space for a few new trees. I suggested some pears and have been asked to research varieties.
It is Zone 5b, 5000’ elevation and there is some fireblight pressure, but not too bad (yet?). Avg last frost is May 4.
What older “heirloom” FB resistant pears would you recommend?
I think Seckel checks all the boxes. Maybe Ayer’s?
We’d probably start with only 4-5 trees, so we’d want to manage bloom time for pollination.
Rootstock recommendations also welcome, with some bias toward semi-dwarf.
Thank you in advance for sharing your expertise and opinions!
Paul

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