But to answer the 2nd part of your question; there are *similar* keycap profiles "available"...
But not many since these are for Choc V1 low-profile switches, which are much less popular due to the tiny stem-travel & worse acoustics/feel than MX, as well as being both incompatible with regular MX keycap stems AND having a totally different PCB footprint.
As you can imagine, these kinds of switches are mostly used in the hobby by the LowPro & Ergo keeb community. All of the easily-available, Mass Produced & injection-molded Choc caps have pretty standard/"boring" shapes (like the most commonly seen MBK & MBK Convex sets, Chosfox's similar "CFX" clones, Kailh's own Choc sets, etc.)
So, with Ergo stuff being the way it is (a.k.a. - in a constant state of experimentation & R&D), the vast majority of the really interesting & custom low-profile keycaps are designed & made for open-source 3D-printing, these days using various forms of printable Nylons/polymers by SLS/MJF printing services:
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BUT; there are some other options for less visually-identical but still-fun (and more comfortable) that DON'T require you to order custom nylon prints from China! The most similar & only ABS injection-molded option (for now) being LPKB's recent "LDSA" profile - which is pretty much just DSA profile, but with a deeper dish and Choc stems.
I have a set and they are literal gamechangers for giving Chocs real-world useability compared to the constant mistypes & losing Homerow when using the flat-square profiles combined with the tighter switch-spacing that Choc keyboards/caps use. Here's some shots showing them next to MBK Profile (the Katakana legended caps):
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And finally, the other easy option is Pseudoku's custom-made/designed ergo profiles, which he sells through his shop (Asymplex.xyz). He created & sells the popular "CS" & "DES"-profiles (the latter of which is now available for MX & Choc), and offers a TON of the most affordable-yet-incredible artisan keycaps one can get.
His weekly drops are mostly beautiful artisans in casted standard-resin, but his custom order ergo stuff is all Cold-Casted Porcelain & dye, which has the smoothest, high-quality, almost stone-like texture. And he sells Made-to-Order singles or full-sets in any choice of colors & profiles, and pre-configured combo-packs, as well as his weekly assortment of custom artisan drops! Here's a set of his Porcelain & Tungsten cold-casted CS thumbkeys I got on the A.Dux I posted above:
• "Work Louder" is literally just the name of the brand.
• And if you only need a Macropad to use *ALONGSIDE* your own keyboard—but still want one with this styling & part of the W.L. economy—you'd be much better-off saving yourself a bunch of money & deskspace by getting their standalone Macropad kit instead (the Creator Micro):
https://worklouder.cc/shop/creator-micro/