Well, with all these <color>-on-white alpha options being added, I really hope the black-on-tan option, as in the original concept, comes back. If this is just becoming an "NES" set then I can safely ignore this thread, but if it becomes all about the 8-bit legend font with different color options (the original one in particular), then I have a reason to continue paying attention.
As for the font, just be sure not to antialias the glyph graphics that you send to (whomever makes XDA). Make sure they are aliased so the individual pixels are easily discernable. I say this only because when making sample graphics there is a tendency to just unthinkingly allow the software to antialias the entire image, which is fine for everything except the legends in this set.