I‘ve got a similar issue with a similar remote
Did you solve your problem?
In my case the keys (KEY_PAGEUP & DOWN & BACKSPACE) don‘t work.
I changed the evdev path. I added them to „handleKeys“. I added them to „keyMap“.
I can see them in „evtest“ working- KeyCode 104 & 109 & 14
But in „viewnotifications“ they are not displayed
The other keys are working with keybindings & carousel.
But i need two more keys xD