Then you could also try patching /etc/X11/xinit/xinitrc.common, i.e. adding the
default.desktop as first priority
about line 80 (symbolic, not a real patch!)
- # Pick a session description file.
- for file in
${dir}/{plasma*,kde*,gnome*,xfce*,lxde*,icewm*,*}.desktop
+ # Pick a session description file.
+ for file in
${dir}/{default,plasma*,kde*,gnome*,xfce*,lxde*,icewm*,*}.desktop