Sorry, but I can't tell what type of applique you did with the others?
I'm guessint you have a machine stitched edge, being that you're concerned about the back appearance.
What about machine stitching in the same manner as you did for the others.
Yes, it shows on the back as you said ... but cover that over with your label on the back overtop of it and/or put a couple of flowers on the back, and hand stitch them on.