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Yes! If that kitting was available in DCX, I'd be super interested in picking up some sets. Combining Ortho/staggered in one set is neat. And I like to see multiple options for backspace, enter, and shift (unlike some 40s kits).
Sweet! 40%/extension and spacebar kits would be great to see in DCX. >

Also am a 40% (well, currently 50%) user and can confirm would be great to have more in stock options, what board you have? >

Currently, I have an ortho contra, and I have plasticity on order. Looking at getting another one soon, but it's really hard to find kits which cater to some of the modifier sizes out there. >

The Plasticity looks very cool but the R3 1.75u is hard to find indeed (I think normally these are 1.5u correct me if I am wrong) as for the Contra is it simillar to the Planck? My problem with those two particularly is that I can't live without a row for numbers, that's too inconvenient for me personally kudos to you and those who can lol! >

Yep, it's typically 1.50u or sometimes 1.25u. If an extension kit included R2 backspace, R3 enter, shift, split spacebar, and extra B keys for Alice/Arisu, most layouts would be supported, right? For example, many GMK and MT3 sets don't offer support for these. And the kitting is different from set to set, which is frustrating. 
Yep, the contra is similar to the Planck. It's a neat board for sure. I can't work without numbers either, but that's what layers are for!