I sent an inquiry. They have US and Canadian distributors, but no European distributors, and seem to tightly control who may distribute the plants. If I can't get ahold of a proper cultivar, I may have to buy a bucket of fruit the next time I'm in the states (for the pits), then cull based on quality at maturity. Hey, I have over 8 hectares, there's no shortage of space for experimentation
They won't require much in the way of heat hours.
Define "much".
Average July high in Reykjavík is 14,2°C/57,6°F, and my land is about 100m elevation (~0,6°C/~1°F cooler). A typical "hottest day of the year" in Reykjavík is in the lower 20s °C/70-75°F, and occasionally not even that. The all-time record high is 25,7°C/78,3°F. Our winters are quite mild for our latitude (our average January low is the same as Las Vegas! -2,4°C/27,7°F, but our summers are extremely mild. That said, it's been warming in the arctic faster than the rest of the world; our last decade has averaged about 1°C warmer than the long-running average.
I'm not sure where you were in northern Alberta, but just random guessing at Fort McMurray, I see that July highs there are an average 23,7°C, record 38,9°C, with average highs from May through September higher than our July high. But of course the winters are vastly colder, with an average January mean of -17,4°C. Continental climate vs. maritime
We're also windier, particularly in the winter, when we average averaging at least one storm of hurricane strength per year and gales perhaps twice a week on average, with gusts occasionally reaching up to Cat. 5 hurricane strength in a bad year (although summers are relatively calm, at least by our standards)
At least our soils are good, once you fertilize them (most are depleted and eroded due to overgrazing... but with proper nutrients, volcanic soils are excellent due to superb drainage and cation exchange capacity). My land mainly needs phosphorus, which is something I'm working to remedy; I had two samples tested, one from a grassy (but thin) area and one from where almost no grass would grow; normal is 20-50ppm, while the grassy area measured in at 15 and the barren area at 4(!). But on places where I've had the neighbor dump horse manure, everything becomes lush and green around the pile as the nutrients leach out.