I still haven't found a solution. There is also a ticket in the bugreport system, which hasn't been solved for now, i added my information in order to add more awareness to this issue. I really like the idea of having such a plugin as it makes cross compilation so much easier / cleaner. I really hope that the development will be continued at some point...

Here is the link to the ticket: https://bugreports.qt.io/browse/QTCREATORBUG-25981