Are you open to suggestions? I would think the following will attract some interest.
How about English black, Shift green letters, Alt blue letters, Control red letters, and Esc red letters.
It would look similar to the following, except base color would be white instead of grey.
pic source: AKIMbO's sale thread
http://geekhack.org/index.php?topic=36881.0If additional colors are no go, all black will also do. We have seen many dye sub keys, but we haven't seen a lot of black legend keys. The only black legend keys I saw were on grey caps. I wonder if there is some kind of technical difficulty in getting black print on white keys.
What do you think? If you are willing accept my idea, I would advertise it for you at KBDMania and put in a order myself.