I'm curious to see how this theatre of the war shakes out. I'm assuming that the German colonies out in the Pacific, East Indies, and Philippines are all toast - as pointed out in the update, the French are gonna have total naval superiority in this corner of the world at the outset, and all of these colonies will be fairly easy to isolate and reduce at French leisure. The Germans also have no hope of successfully defending Cambodia, but at least there there's a prospect of a von Lettow-Vorbeck style guerilla campaign holding out for at least a while.- A Storm in the Orient
I'm more intrigued about what you're plotting for the Dutch, though. Obviously declaring war on all the Central Powers is suicidal, but it's not out of the question that if Japan tries to jump in to try to yoink Formosa, Hainan, and the Pescadores for themselves, that will draw a Dutch declaration of war in response -solely on the Japanese- which would make relations back in Europe, well, interesting is an understatement I'd say.