You might also like to consider a visit to the Food Garden
here at UBC. We've dozens of different apples and pears growing that would be suitable for a small yard, many of them espaliered
To source heritage varieties, I suggest keeping an eye on next year's events at Seedy Saturday
(at least for pears), or dropping by this year's Applefest
- heritage trees are available.
I've also forwarded your question to Tony Maniezzo, the Horticulturist who tends the Food Garden - he might chime in with a few recommendations, but he is understandably quite busy at this time of year.