I understand that the first reply for this would be “Go ask on Gnome’s forums”. But maybe here someone came across such a scenario, and maybe is familiar with how to approach it.
What I am looking for is the functionality, by which one keyboard layout, for example English, has different implementations - US and UK. And you have a 3rd layout, let it be Russian.
Windows has two keyboard shortcuts - one basically switches between groups → english(the last one selected) ↔ russian. And the second one, while “english” is chosen, allows to switch between “US” and “UK”. Meaning that switching from En to Ru and back is one layout change call (instead of going en_us → en_uk → ru).
The thing is, 90% of the time I switch between en_us and ru, and only in the remaining 10% I actually need to switch to en_UK. So I would wish to remain with only two kb shortcuts - alt+shift(to switch between layouts) and cltr+shift(for the sub option of a layout).