Spacebar kit has 1.75u. Are those supposed to be 1.25u or are those just not displayed in the spacebar kit yet?
That will be updated soon, we've got a few kit updates from GMK that will be going into the OP as soon as we're ready.
Now as far as the current discussion of blanks, ortho, etc:
Basically, I opted to go with a level of coverage for smaller boards where you may not have proper legends, but the profiles should work. There's enough 1u keys to cover a planck, as well as a 2u R4 key (although it's not convex, but still).
Honestly, this is kind of where I find myself thinking "I'm not going to try to please everyone". This set has a pretty good amount of compatibility, at what I think is a pretty good price. Trying to add enough keys to make the compatibility much better is going to press into a price range that I simply don't want it at. I hope that isn't taken harshly, as I understand completely wanting proper legends, or even blanks, but I just don't see the benefits outweighing the costs here.
We're also trying to get out ducks in a row to hopefully be ready for GB on Friday, so trying to make kit changes and get adjusted price quotes is pretty cumbersome.