I just started using CoreELEC on an Odroid N2 and I am quite happy with the results but it took me a very long time to find out how the keyboard layout was supposed to be changed.
Changing the layout in the CoreELEC settings addon did nothing. I saw it running
loadkmap < `ls -1 /usr/lib/keymaps/*/azerty.bmap` in the debug log but the layout was still qwerty. Changing the value to any other layout had absolutely no effect.
After a while, I found out that the right way to change the layout was in Kodi’s System → Input → Keyboard Layouts.
Therefore, I think the option should removed from the addon and there should be some kind of documentation for this because I’m not the only one who’s confused: Keyboard set to wrong layout