With the topic of expansion now viable, something which will become relevant, especially with the matter of von Lettow-Vorbeck and Adenauer at the head of Germany, is the former German colonies (LV because of his colonial general background and Adenauer as the former head of the German Colonial Society). Even the more liberal parties were big supporters of regaining them, and their theft in the Treaty of Versailles was considered illegitimate by most.
My question is in regards to the German colonies which are now controlled by the British Dominions, like Southwest (part of South Africa) or Kaiser-Wilhelms-Land (now controlled by Australia). If Britain were to try and sell (never give, heavens no!) some of Germany's colonies back, would they be able to actually compel the Dominions to do so? I know that South Africa would oppose the sale, for one. Australia, too.