The Point is that it does not matter who you put on the throne of Spain, it is not the Iberian Union since the Kingdom of Portugal and Brazil stayed independent of both Spain and France during the Napoleonic wars. The Portuguese royal family, most of the Portuguese royal families and the government with the army was in Brazil. The French defeated a joint Portuguese- British army not defeated Portugal and annexed it. It is the same with the British, the French defeated the British and expelled from the Iberian Peninsula but Britain continued to be independent that is the same as with Portugal.That's fine, but I think that it makes since for Joseph to be given all of Iberia after the war. But having a Portuguese army in Brazil that can join the war is pretty cool and not something I considered. Unless you think there is something more likely that he would have done? The POd is in 1812.
I am playing to have a war between France and allies vs Russia, Britain, Austria, Germany in 1845. Haven't really decided what would happen yet.