That can be fixed outside of Windows [0]. What you're looking for, is a ISO Level 3 Shift (at least as far as X11 is concerned. Don't know the terms on windows

That can be fixed outside of Windows [0]. What you're looking for, is a ISO Level 3 Shift (at least as far as X11 is concerned. Don't know the terms on windows). I configured my keyboard to use the WIN keys as that. Super I only use for window-management related things, which I don't use is all the time and I can configure the actions to be on my right-hand. Therefore, since CAPS is useless, I remapped it to Super. This way, with the dead keys, you can create many composed symbols. For writing French, an US layout is perfect, and I can type as fast as on a French keyboard. For your particular case, I don't know how to create the Ż, but Lvl3 + e + Z -> Ź. It's likely that if you used a different layout, this would be possible. --- [0] I've tried multiple times to get a keyboard layout like on a mac, with its deadkeys system, but never managed to remap the AltGr properly.