Ok- I changed my mind. Here's a sneak peak. I'm posting because after working on this tonight, I have some lessons learned to share.
1) I was wrong about sanding on a hard flat surface like the granite block. For one, the nameplate is probably not flat, unless it's new. And for two, you can't tell how aggressive you're getting and might sand too far. I did this in a couple areas. I think I'll be able to fix it, but it certainly won't look as good as it could have.
2) The liquid mask works exceptionally well.
3) 1000 grit might be a bit too course, actually. Next time I'll try 1500 grit.
4) Use a small strip of paper on your finger rather than pushing the nameplate against a flat surface. I found I had far more control this way.
5) Don't be afraid to use an exacto blade on stubborn areas- going to town with the sandpaper will inevitably take off paint that you didn't want off.
That's it for now... I have some touchup to do, and then onto the black areas...