Is there a way to switch back from KDE Neon Dev to Neon User?

I still cannot get kontact to work on Dev / Stable due to library version problems.
This problem seems to be resolved on KDE User. https://mail-archive.com/kde-bugs-dist@kde.org/msg63086.html

Solution from other thread might help
viewtopic.php?f=309&t=134986&p=361828&hilit=pin#p361828

@apachelogger, the first part I already did. I will try the rest of it (the daredevil I am). Thank you for the (I hope) great advice!

@apachelogger, it really worked! You are my saviour!

Just one issue remaining: In the User edition I have no non-KDE-apps tray icons... That worked on stable dev.