[sectune]

Thanks a lot for the useful hints! I use the harmony remote so unfortunately the keypress trick will not work on me. I also tried to setup the app to auto start Kodi from the app store, it does only work though with SPMC to my knowledge so I guess there are no alternatives left?

Just to reply to myself with an answer: sorry, I was stupid, but your replies did get me in the right direction I just needed to edit the shutdown settings on my harmony remote to not turn off the shield (Devices > operational settings > edit the settings for "on"/"off" for shield device). D'oh.