You are being very thorough. I think doing a rubbing and making a stencil would be easier or at least a good back up plan. Blue or yellow first then the other. This man agrees...
Masking film would be much better to use than bits of tape - it is a soft re-positionable plastic film you cut it with a craft knife (or scalpel) if you trace what you have you should be able to cut (carefully) the yellow and blue stencils in one go.
Hand cut from Vinyl to do this fork. Primed the fork. Painted the yellow first, then the blue.
The Paint matched put into a spray bomb was $84 for the two colors. Enough paint to do three forks. www.facebook.com/seeingisbelievinggtmuseum
Then search team scream fork on the page.