Doesn't unicomp make custom keycaps in black?
They sell
blank black keys, but black isn't a choice on their custom
printed key page (though it's included in the graphic there), so I'm guessing they'd have to be blank. As you probably know, you can't dye-sub dark keys, and they don't have engraving technology.
Makes you wonder what they do on dark blue keys, though, which they
do offer printed—pad printing? But if so, why not offer that with black too? You'd probably need to call them, and have someone there who could interpret deep Southern accents.
BTW, it's tough having OCD
and ADD. You're always paying obsessive attention to things like this, but you can do it for only a few seconds till your mind wanders. So you
have to become an ultra-fast typist, or