That's pretty good, because the alternative is to keep all three base kits as they are, with a hagoromo child kit and an original oblivion mod child kit. Then you need to buy two child kits if you want hagoromo and oblivion mods, and you still won't have the navigation cluster, numpad, and arrows unless you get a base kit on top of that. One can make the argument that this round should not have cared much about standard oblivion mods, so it's ok for anyone wanting that specific combination to have to pay more. But at an apparent 50/50 split in preference between those and git mods, that solution might alienate some buyers.
Another option is to make hagoromo part of the monochrome base kit, in which case anyone that wants hagoromo alphas needs to buy the monochrome base kit. The end result is potentially having a bunch of excess monochrome mod kits on the aftermarket, but that's not terribly different from Ensaum's suggestion, where instead you might have excess git or standard oblivion mods on the aftermarket. I'd argue it is easier to sell off either of the colorful mods, especially with a set of alphas you don't want to keep from the one of base kits, since others might look at a monochrome base kit on mechmarket and not be able to tell or care for the difference between it and Honeywell or Dolch.