Hi Lukas,
I tried your approach, it helped but I had to enhance FITV_FPM component to navigate back to the POWL.
Here are the steps which I followed.
1> Enhance FITV_FPM component -> controller 'NAVIGATION' -> method NAVIGATE_EXIT
In this method I wrote the code to call the POWL application
2> Added a OBN path to the Role -> Powl Application in PFCG.
Regards,
Swapnil Indulkar