I can think of an out of the game reason: because Tannu Tuva ruled in HOI 2 and should exist in as many timelines as possible! Revive Tuva in every world!
Maybe make the already slightlly authoritarian democrat United States have some border dispute with the Confederacy, which leads to a secret pact between Germany and the United States ala Zimmerman Telegram.
Are we still going to Paris, or is that idea already dropped ?
I wouldn't really envy the Platineans, they are practically alone in the continent... If you want to cause some troubles to MittelEuropa, I suggest you to support secessionist movements inside Austria: let the rotten stucture collapse from the inside!