Mark,
Achievable to what degree? If you mean indistinguishable from original, the panel shown in your second photo doesn't cut it. If you look at the taper inside the top two screw holes, it is shiny and will reveal a little shiny ring surrounding an installed screw. Originals show bright but dull, unbrushed Nickel in such recesses. Driving the scratches further down to hide such bright areas is not a match, either. Originals were done quickly, en mass with large diameter burnishers and there were many such untouched areas, especially on brake levers and later '31 instrument plates. It may fool some judges, but it is not identical unless you start with matte nickel.