Are there sufficiently many Americans shopping in any individual supermarket who are willing to pay for that cheese for it to be worth that supermarket stocking that cheese? Distribution to retailers is not a simple problem in the food industry.

I would suppose so. Supermarkets in both Europe and America have made gigantic improvements in just the last 7 years in variety and quality of products they offer. Most people haven't noticed since it's a constant and accumulating process, but you find much more stuff today in the supermarket than what you used to. And the reason is partly from greatly improved logistics and distribution.