I wouldn't give to much hope in german bases with Eurowings Europe. Their plan is to employ crews outside of Germany and avoid german labour rights.
I am always surprised when people consider facts for the future of a company that totally base on rumors and know one knows if it ever gonna happen.
At the moment Eurowings Europe has no base in Germany and no-one knows if they ever will have a base in Germany, as those positions are taken by Eurowings Deutschland and Germanwings. Some people mistake Eurowings Europe with the Eurowings platform.
So you might be gambling on a game that is already lost.