PseudoMakeMeKeyCapProfiles VS Skeleton-Dactyl-Mini

I haven't tried those, but this seems to be it.

If you have access to a 3D printer, I would recommend handwiring a Skeletyl or Scylla.

if you are looking for a sculpted/keywell design I would start with something like the https://github.com/sanderboer/chonkybois or https://github.com/Bastardkb/Skeletyl then work on refining your needs from those ideas.

There's these made by Quentin, which can be mirrored for Skeletyl/Cnano.

Awesome. Do you think single-key RGB would be an issue? Would it add too many cables? I'm currently looking at the Skeletyl, but am intimidated by the four additional cables per LED.

If you have access to a 3d printer you could print something like a skeletyl or a dactyl manuform and then handwire it with some diodes and wires. That's the cheapest way I can think of.

I'd throw BastardKBs Keyboards into the mix as well as he's open sourcing all of his designs, for instance the Skeletyl or the Charybdis

You can take a look at the Skeletyl. It's a 5x3+3 design. Basically the upper three thumb keys of the one you posted and with 2 keys less on row 3 and 4.

a printed, blue Skeletyl