There's something I really want from my iPad: support for custom keyboard layouts for attached keyboards. Mine is currently unsupported, so as soon as I need to

There's something I really want from my iPad: support for custom keyboard layouts for attached keyboards. Mine is currently unsupported, so as soon as I need to type something I need to put it away and use another device, even if the iPad would be totally up to the job otherwise. Say, replying to emails or writing some sort of rough draft.