If you don't mind the cost, then go to ebay and look up shrink tubing in the electrical sites and look for clear tubing, I have used it and its a little thicker but it shrinks all around the lure. Right to the profile of the lure. I took my lure and made what I wanted to cut out and placed it on the lure , you can either draw or paste then put the tube over the lure and shrink it then cut out what you want then cut the bottom of the tube and you have your stencil. You will have to get the right size of tube and play with it. Once you have what you want then its easy to slip on the next lure. Hope it works for you, you do want the sleeve to slip on with a little play then shrink. I do this on Musky lures I can't say about bass lures.
Wayne