If you try to sand the edges of the new pattern smooth to the old surface you may be able to get it to feel ok but the edges will look very rough at best.
It's very common to see a pattern laid down, the surface sanded and pinstriping applied along the entire edge to give a clean, but raised, line.
Aircraft Remover won't mask to a clean edge. It will undercut and/or disrupt the layers of the masked area. Even if it worked your chances of getting the new paint and the old to "butt up against each other" perfectly flush and actually bond are minimal.
The normal way of painting a graphic that looks perfectly smooth is to apply it thin, coat over the entire surface with clear and sand the clear flat. Depending on the thickness of the pattern it may take multiple clear coats and sanding stages.
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