I think - and I've said this before, that everyone is massively overestimating the difficulty of the problem.

In order to balance the european economy,
Germany needs higher wages and higher consumption. Germany has the productivity to back those up, so they can afford it.

It bloody well has to be possible to get popular backing in Germany for a policy of "Germans should be paid more money and have more fun for the greater good". Seriously. How is that not the easiest political message in history to sell?

So basically, what is required is simply that the arguments of Keynes be translated into German and circulated in venues where Germans will actually read them.