Apart from some minor legend discrepencies to the base kit, I'd highly suggest not to run an alternative modifiers kit for the different colour through GMK.
Umbra did a similar thing initially where the alternative modifiers kit was only slightly cheaper than the full base kit, with some vendors pricing it higher. This makes it non-sensical to run such a kit, so it'd be best to remove the option completely (as Umbra did), or if there's enough demand, run as an alternative base kit.