You make them, and YOU sell them? Or you make them, and SHE sells them?
Best and easiest way to keep the bark on? No brainer. You cut them, give them to her, and let her figure out how keep the bark on. 'Cause if you try to keep the bark on, and it fails, it will come back to bite you in the butt. So, let her try to keep the bark on, and it'll be her worry if it doesn't work, not yours.
Me, I'd probably just nail it on. Hehehe