Thanks to JohnRCooper for starting this poll! We've contacted the vendor on your behalf and they've made the Dasher & Dancer SA Custom Keycap Set available.
hhkbp2 is correct. The COLEVRAK kit will provide only those alphas that are located in a different positions from standard QWERTY, and the PLANCK kit will provide only those modifiers unique to Planck layouts. But you'll still need the TKL kit to fill out the other alphas. It is unfortunate that you'll end up with so many keys you don't need, but a DVORAK Planck is a rare beast with unusual (and costly) needs. Cheer!
JohnRCooper
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hhkbp2, JohnRCooper, thank you for replying! I should have looked at the Desk Authority thread renders more closely.
Looks like each of the sets have, by themselves, passed 200 and the both sets option is up over 350. The pertinent images, documentation, and pricing info were submitted a while back. Hopefully we can get word on this one becoming a buy in the somewhat near future - I do realize there's a lot of buys going on and it will take time to get to this one.