Hi, Thanks. We really tried.
We can't change the zippers, unfortunately. It would cause havoc on their sewing facilities, which are not geared for one offs/aka sample making.
Yes, we could do "titan grey" or "black hole". You can just write the color ("titan grey" or "Black Hole") into the comments, since I have to translate everything into SNS Herning ordersheet talk anyway, but if you prefer, I can also make a link for you.