This is not exactly what you talked about doing but close enough to give you an idea of how it could turn out. This is my wife's sportster tank. I repainted it a different color basecoat and then several coats of clear. After wetsanding the clear until totally smooth I applied a stock HD tank decal. Then I added more coats of clear until the decal was very thoroughly covered (almost no perceptible edge). Then after wetsanding again the black flames and outline pinstripe were added by hand with a brush and allowed to dry. Then more coats of clear until the entire mess could be wetsanded and buffed with almost no feel to the decal and none at all of the flames and stripes.
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