I'm in for white on CMY just the way it appears in the original post. Almost because of the low contrast btw the white on yellow.
The way it stands now (thanks dianoda for that awesome pic) certainly complements dolch very well but I suspect it would work well on any WoX keyset (X any dark color).
Also... The low contrast on yellow screams enthusiast at me in a way that makes me want to listen. Because... It still looks elegant as hell and let's face it: if you're using this on any WoX set (which I suspect would be the primary use case here) how much contrast do you need? You aren't going to have ANY other yellow keys in this usage scenario so the fact that you doubleshot its legends in white is just "more sauce for the goose" in a way that only an enthusiast would appreciate.
And what's more: to my eyes at least, these aren't just uber enthusiast, they are uber elegant and some how more serious and deliberate looking than WoRGB (which I also love).
Of course GMK only though: goes w/o saying, I suppose.