There is no worries about feeding a live hopper to a BP. I have fed all my snakes live and there is no possible way that a hoppers teeth can break the scales of a young BP, (new hatchling maybe), so there is nothing to worry about. When you buy a snake everyone should be ready to feed live if circumstances like this arrive. I can see that some people don't like feeding live but the way I see it snakes should be fed live just like in the wild. Not saying that feeding F/T is wrong but a lot of people don't know how to do it.
Good luck
I am new to the forum, while I am no expert by any means I am not new to snakes at all.