why do you want them? Hiro seiko has some for transmitter. Why do they have to be self tappering? Keep in mind aluminum screws are quite soft and they are not too nice for self tappering purpose.
Depents in which country you live but some companies specialized on bike parts do colord screws on demand.
Second solution could be to buy a titanium screw kit and get them anodized, you can get the same blue like AE has for the turnbuckles
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