Thanks.
I plan to stay in KDE land for the foreseeable future and when I have a spare time I will release a more refined combination/theme.
The idea of middle gray as a starting point for UI is well established but not popular nowadays in the world of high contrast and saturated color palettes.
For the moment the combination is to apply Breeze Dark default workspace theme, Nordic-Darker icon pack, SF Pro Display Medium and this color theme.
https://ibb.co/nPmHYfg