This question contains the (possible) solution as edit
Some of you had the opinion that I should have answered my own question instead of doing an edit of the question.
Pro (putting the solution as edit):
- I wanted to document my findings as well as a solution just below the original question (like I put important facts on top of any wiki article).
- There was an accepted answer that lead to the described solution
- Answering my own question is like talking to myself (which is the first sign of mental problems)
I would like to hear/discuss your arguments here why I should have answered my own question instead.