When I see seed stock for sale, I know that I can buy and grow Kentucky Burley, and the details for how to fire cure is available in many places online and in print.
I have no idea whether DF Kentucky is actually produced commercially outside of Kentucky, but I do know that the lines between Kentucky and Tennessee farmland is vague. But, are you absolutely sure DF Kentucky is not produced outside of Kentucky or the US?
Virginias are grown worldwide, with very little actually being grown in Virginia, comparatively. Maryland is not just really grown in Maryland. These are where the strains were developed, but not limited to just where they are grown. So, it wouldn't surprise me if DFK were being grown elsewhere, but I have no idea whether it is or not. Just posting out of curiosity.