On the horn that you show in the pics, you would cut the strips from the outer curve and the inner curve of the horn. If you were to cut where the horn was the flattest, it would be very difficult if not impossible to straighten. So judging by the pics, it appears as though you are limited to a bow about an inch or so wide.
I would be interested in the group purchase if the price(s) were right!
P.S. Thanks Jon, for the kind words.