Leave it to the Bavarians!!
(Bayernfeige = Bavaria Fig)
If this can tolerate weather of Bavaria, this should be a very cold tolerant fig that would be suited to z6, maybe even z5 with minimal care. Not that the weather in Bavaria is terrible, but in my few trips there, it was not amazing either, reminds me of chicago without the wind, or maybe New Hampshire/Vermont.
I would say this should be a good fig for trials in our north. But if it is patented... this means it's illegal to propogate via cuttings, yes? Or is it not patented in the USA? Or are patents internationally recognized?