Avitt -- A brown or rust (or whatever your preference is for aged tritium) artist's pencil should do the trick. No muss, no fuss & and every artist's supply (and some office supply) has them. But, were it mine, I would leave them the way they are.
The thing that catches my eye is the overall pristine appearance of the entire watch. The crisp lines and perfectly smooth surfaces. Even after a Rolex overhaul (which is usually the look I go for myself), I do not think the case and dial would look quite that pristine. Actually, I think what bothers me (and it is a relatively minor detail) are the perfectly rounded edges. I think you may have smoothed them a bit too accurately. New, the lines would be crisp & clearly defined. But after 30+ years of use, Rolex overhauls & successive polishings, there would be some irregularities in the lines of the case and bezel. That is why I purposely took a file to the sides of my DRSD (you can see this in some of the recent shots of the He valve side of the watch), so the light would reflect differently in the peaks & valleys of the metal that would have appeared after successive polishes.