Hello,
checking Lunar and Kudu, both releases do not support changing either file or folder language using keyboard shortcuts under xorg, unless space button is used.
By going to settings->keyboard->View and Customize Shortcuts->Typing:
I cannot use any other combination but space button with others.
I can change language using the Alt+Shift e.g. in a browser, yet not under files or folders. This happens both under ubuntu xorg and flashback.
Regards!