One minute
Disable “Eject” in keyboard settings. It is the first entry under “Sound and Media”
create a file, ~/.Xmodmap, adding the line:
keycode 151 = BackSpace
run
xmodmap ~/.Xmodmap
add that to wherever your startup scripts are for persistence
The keycode mappings I got from xev, kind of like “keyboard viewer” in OS X. Its available in the Solus repo:
sudo eopkg install xev