I have managed to do a script on the confluence skin which automatically loads the DVD and start it.
I have named it DVDplayback.sh
by doing
touch DVDplayback.sh
creating my bash script
#!/bin/bash udisks --mount /dev/sr0 sleep 4 kodi-send --action="XBMC.PlayDVD()" exit
enabling the script
chmod +X DVDplayback.sh
sudo chmod 4755 DVDplayback.sh
And replacing in /usr/share/kodi/addons/skin.confluence/Home.xml
<on click>DVDplayback()<on click>
by <on click> System.Exec(/home/osmc/DVDplayback.sh)<on click>
All my DVD’s start proprelly now.