I'm fairly certain that Hungary enjoyed a measure of autonomy within the Austrian Empire at the time, couldn't he simply attempt to play the autonomous government of Hungary within the Empire and slowly make his attempt to break free? Although if there is going to be an Austrian player it could possibly turn them away.

On another note I am wonder if certain world events will take place that happened historically. For instance, the Mexican War of Independence ends later in 1821 and was pretty much over by this time. Will that situation be resolved along with Peru/Brazil, etc?