This submod allows you to turn Austria-Hungary into a trialist state later in the game via a national focus. Requires Wolferos & Friends' The Great War Mod. (I also try to keep up with Wolferos' team's policy of not using any paid dlc content).
Adds "Trialism Reapproachment" national focus, the related events, and a separate event, which renames Austria-Hungary to Austrian Empire if Hungary exists. Note, that this last event currently has a 20-day MTTH.