Change remote key mapping

I have made a new install of LibreELEC on RPi 3. This system takes place of my old Ubuntu/XMBC HTPC built on ASUS AT-3 IONT-I. However, the old ASUS had a usb remote. I tried to plug it in and it works out of the box. My trouble is one single key mapping.

The “HOME” key in the left part is identified as “KEY_DELETE”. This is a very unfortunate key/action. It is almost impossible to remap this action in keyboard.xml (and it does not make sense also.).

I would like to map that button to a different key (KEY_HOME), however while on the old Ubuntu i was able to do this, I cannot find the map files in LibreELEC (I tried to study LIRC (wiki) but without any success).

Any help for me?