and why I truly understand your motivations, this is not how OSM works. OSM reflects how the world is, not how the world should be. So right now for e.g. :de it would be official_name:de and alt_name:de as Kyjiw and name:de as Kiew (and yes, this might change in the future if Kyjiw becomes familiar in German and is widely used in German. But this is not the current state in German so this would not reflect the current reality).