These are interesting ideas and I'll definitely investigate them.
The problem with the JTK sliders (aka kbdfans Adapter-X) is primarily that the Chinese are ignoring the tolerances of the original designs:
https://rix.li/topre-to-cherry-mx-adapter/Note carefully that the JTK sliders have square corners on the 2u sliders, and this design shows the better and more compatible rounded corners (after what I can only assume was extensive testing). Also, this design has a nice design for spacebar stabilizers which I have not seen on the market at all.
The weird part is that the original design files are open source so it makes no sense why they would cut corners like this (or, in the case of this bad pun, "not cut corners.")
I assume also that the original design has a proper height and width tolerances to a) reduce wobble and b) ensure compatibility with GMK, SA, DSA, OEM, etc. Reports are that the novatouch sliders are too short and the JTK sliders are tall enough but are too skinny, thus more wobbly on the 1u sliders.
If you can solve that I'd pay a premium for better made sliders. JTK and Novatouch are close but no cigar.
Here's a review that explains some of the issues:
https://imgur.com/a/CBmWX#RQmRf4oI should also note that even though you can replace the sliders with JTK sliders, you still need to drill the 2u housings for compatibility with SA keysets because of the extra stems on the left and right side of the cap will slam into the housing. Novatouch got around this problem by modifying their stem housings to add holes on either side of the stem so the extra keycap stems can just poke through.
Don't get me started on spacebar compatibility issues.