Hi,
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I doubt there is any legal way to have a foundation subsidiary here in Germany that is under german law (important for tax exemption and so on), open for german members but still completely controlled by the foundation. The highest board of every german e.V (and also of a german foundation) are democratic institutions, so everything is controlled by the members. If you want to open the organization for other members than the foundation (and you need at least 7 members for an e.V), you *must* give up control. I think that will hold true for every EU country, not just for Germany.
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For the French organisation, we will have in the status something as "a representent of the Wikimedia Foundation" has veto power over such and such decisions". It has to be precisely defined yet. This is legal in France for non profit organisations.
Just my 2 cents. Yann