> I have had zero problems inputting Japanese and Chinese.
That may be fine.
Neo2 does not work. Neo has 3 modifier keys, Gnome/Mutter/Wayland/Whatever does only support two. Neo2 has a compose key, Wayland does not honor it.
I use mod4 for navigation (arrow keys, site up) and compose for Slavish (read Polish) input (źżąę)