Going to go in the opposite direction here.
I missed the discussion about changing the ergoplank kit. It happened pretty quickly. I know that you just changed the kit, but I'd recommend reconsidering.
While the Space Cadet Assembly kit might be appealing to some, it does not appear to be on track to hit MOQ. Without a lot of help from vendors, it's not certain that the kit will be made. It's disappointing for sure. But I'd say that it's a red flag for this kind of kit. Even if Carbon R2 is expected to be an overall more popular buy, this a kit set up in this way may still under-perform, even if it ultimately hits MOQ.
I actually dropped by this thread to offer a different suggestion: drop the alphas from the ergoplank kit. Serika and Space Cadet, the first two GMK GBs to attempt this all-in-one kit have had those kits really under-perform. Serika, a drop with about 1,000 purchases, didn't even sell 30 of dox kits. Which is again, hugely disappointing. That kit was even cheaper than Space Cadet's.
Blanks are better than no kit at all, they're cheap, they sell pretty consistently. Or keep the Assembly text (or look at Nautilus) if you're determined to do something different from Carbon R1 .. though, you think people would actually support Assembly if that's something they really want.
My suspicion is that there are just not enough people that want to buy into a GMK set to exclusively buy caps for a non-standard keyboard like the ergodox. While it is considerate to try and have people to pay as little as possible by including alphas, ultimately, it just hasn't come close to working yet. (fingers crossed that Space Cadet will prove me wrong)
Consider that there are two alternate-color alphas sets. You do not
have to buy the base set to completely cover a planck or an ergodox. If you're determined to have the original colors, then you buy the base set and down the road, it will be more useful if you want to put it on a different board or sell it.