Hey Mike!
Well... how steady is your hand??!! LOL! Here's an old auto detailer's trick, and it just may be the ticket for you here:
Get yourself a NEW Black "Sharpie" and "Marks-A-Lot" indelible marker. I think you know the rest... Carefully fill in all the areas that need to be black using both these markers. Use the "Sharpie" for the outlining work as it has that nice sharp tip. Use the "Marks-A-Lot" indelible marker to fill in those areas. Work slowly, allowing the marker to dry before continuing, especially if you're left handed. You don't want any smudges. You may have to go around TWICE to let the marker fill in and become opaque, as in SOLID Black. After the marker has air dried, it shouldn't smudge or come off from rubbing, and should look as new... or certainly close enough from a distance of about an inch, or less! Here's the cool thing:
Should you not stay between the lines or smudge... NO PROBLEM! ... one swipe with a tissue dipped in lacquer thinner, and it all comes off wiith no damage to the badge, and you can start again. Now,
My only word of advice is to drink LOTS of Starbucks coffee before you begin, as you do want a steady hand! LOL!!!! Little joke there Mike! And yes, I have used this technique with EXCELLENT results. Good luck!
Tommyp