Hello, I'm also having the keyboard problem. I'm trying to use in my project the Sogou Keyboard you told but Im'm having execution issues, even in the SampleScene. The project starts and when I clic the input field the keyboard appears but I have no interaction with it.
The real time errors are these:

An this warnings:

I'm using Unity 2021.3.1f1, Pico neo 3 Pro eye and the latest SDK.
Need help. Thanks!!!!