John Fredrick Parker
Donor
Assuming the Germans will have access to the Med thanks to a puppetized France, Italy, Greece and dominance of the Balkan coast (thank you Austria-Hunagry) they can stir up trouble with the Arabs, particularly if the French are reduced to a rump state in Algeria.
Well, they're going to have to be careful in how they go about stirring up Arabs, since remember, one of their key allies are the (still intact) Ottomans; it may be they go for a proto-Islamist angle, rather than dabbling in any kind of Arab Nationalism. Actually, now that I think of it, German promoted Proto-Islamism is a pretty fascinating cultural butterfly
(Also, Austria-Hungary's technically defunct after awhile, but it's easily a fixable issue for Germany as Austria proper can be absorbed, Hungary can remain an ally, and the Balklands can easily remain dominated -- especially with a comparatively weaker Russia...)