Changing the input language of physical keyboard on Android TV box
I had a similar problem, my Android TV screen did not show the characters I typed on an external Genius Spanish Keyboard.
I wrote to the manufacturer asking for a driver but the answer was they do not provide support for Android OS.
After a trial and error research I found that
Logitech Keyboard Plus 1.3.0 (565k)
com.logitech.keyboard.look_ten
was the solution.
This apk is a Bluetooth driver but worked with my USB wired keyboard, I only had to set the keyboard language data.