I noticed an alternative virtual keyboard that is supposed to have better debugging. See if Stevia is any help.
Stevia is an alternative keyboard for Phosh. It can replace the default OSK squeekboard.
The purpose of Stevia is:
- to allow experimentation without the risk of breaking end user systems
- be helpful when debugging input-method related issues
- be quick and easy to (cross)compile
- allow to move GObject bits and Widgets over to squeekboard easily if desired (hence provide API documentation)
Also, one more old link that may have some leads: Is Virtual Machine Pass Through Possible On Purism Hardware? - #14 by scaled