Doesn't hurt to ask Steve to pass on the inquiry. I don't have any doubt carmina could do it, but it's ultimately up to them as this would probably be a new pattern.
Carmina does a good job in terms of new designs and there's a chance it could come to fruition.
Black is about the only color that would give a sufficient dark contrast to the bronze, which appears olive or green/brown. Walnut country calf would be more subtle, but that's a stylistic choice. I can't recall if any other EG material that is lighter would work.
It helps with the sizing due to last differences between makers. Dropping that much money, at least you want to have some assurance regarding fit.
Edit: You would still go through BB for their unique design and makeups, a lot of BB's models can't be found on the C and J website or stores.
Other option is to blend your own coffee. It is an art in of itself. SO is easier and more consistent. A blend will vary but give you a chance to balance or complement flavors. I really liked Johnson brothers twisted blend. That reminds me I need to pick it up once I run out of my current bag.