Support for Alternative Layouts
This is a summary of how alternative layouts have been supported by kits such as Colevrak and Homing. It is not a discussion of alt layout performance and development, but if that interests you I highly recommend starting with Pascal Getreuer’s A guide to alt keyboard layouts (why, how, which one?). It’s a concise and comprehensive overview with links to some great sites that go deeper. He also has a separate Links about keyboards page. The Keyboard layouts doc he recommends explains layout goals and metrics in detail, summarizing the alt layouts discussed here as well as more than one hundred others. Sculpted-profile The majority of custom keycap sets are sculpted-profile (Cherry, SA, MT3, KAT, etc. - more on profiles generally here) so let’s start there. Because each row has a unique keycap shape, alt layouts require a unique keycap for each legend that moves off its QWERTY row. At first there were two The Dvorak layout was patented in 1936 by August Dvorak & William L....
Apr 23, 2024
(see http://support.wasdkeyboards.com/customer/portal/articles/1366948-keycap-compatibility for "typical" keycap dimensions)
So you couldn't use some random good-looking set that you see like the two-tone set here (https://www.massdrop.com/buy/two-tone-doubleshot-abs-keycaps/talk) Furthermore, different rows usually have different profiles (the exception being profiles like Signature Plastics DSA profile) so you can't readily switch keycaps between rows with different profiles.
I think you're pretty much limited to the black blank set or the $60+ one made specifically for it (https://www.massdrop.com/buy/infinity-dye-sublimated-keycap-set) unless there's another source of keycaps that I'm not aware of.
EDIT: At least this is what I can observe by looking at the diagram.