Not really ...
I would say that the custom mechanical keyboard market was made possible because:
- Switches are individual modules: Most scissor/rubber dome keyboards are made as whole keyboards anyway: with a shared metal frame and shared membrane
- MX switches were made so you could change keycaps on them. In my experience, most scissor switches and their keycaps tend to be flimsily made and break too easily.
- There are several varieties, both Cherry MX and many clones. Whereas all scissors switches of one brand has only a single type of rubber dome (glued to the membrane so you can't change it easily)
Kailh, Omron and Cherry have made discrete scissor-switch modules that appear to be able to change keycaps, but they are quite rare, and they are all "mechanical", with coiled springs - so the feel is more or less just like the full-height mechanical switches but shallower.
I haven't seen any of
Kailh's switches in any product. The Omron B3KL switch is in
one laptop and one desktop keyboard. And the Cherry "MX Ultra-low profile" is brand new and in only
one laptop.
I doubt that there could be any interoperability between these, because they are not clones.
There is a custom keyboard market for the low-profile "Kailh Choc" switch though, but those are also "mechanical" with "mechanical feel": variants of blue, brown, red etc... with a distinct lack of a highly tactile non-clicky variant.
Also, because of Kailh's
weird keycap sizes, most customs with them have been minimal keyboards with only 1u keys and most of them small split ergonomic keyboards.
The only third-party keycaps available for them also have Kailh's weird dimensions.
BTW. I'd rather call "chiclet" a
keycap style: flat with space around it.