Preset keyboard mapping switching

Hi! It would be really nice to have a button which switched all mappings between different keyboard layouts!
I use dvorak but most mods come preset with the qwerty layout, which creates a lot of hassle! Also if I add a mod, it might overwrite something which should obviously already be set in dvorak, such as 'o' (it's the same place as 's' in qwerty—so 'move back')