What you are saying makes sense, and would not be hard to implement. However the trick is to keep the configuration simple for the user. It starts to feel clunky when you are having to select layout and language separately.
One idea might be to have an “freeze layout” switch which if unset (the default) leaves behavior as now. If it IS set, that layout stays unchanged, and only the language changes when selecting by the regular mechanism (either quick-switch or from list in settings).
An error occurred while saving the commentAnonymous commented
Agreed. It's English, Danish and Chinese for me.