While you have the forks removed to repacked the headset, you might want to take it to an auto parts store that has a good selection of duplicolor touch-up paint for cars. You will likely be able to find something that's extremely close to your original paint. If the shop is very friendly (or if nobody's looking) you can even test the touch-up paint on the steerer tube of the fork. Nobody will ever see the part of the steerer tube that lieas between the upper and lower headset bearings, hidden by the headtube.