In reply to your request regarding the Two Kingdoms of Sicily, I must admit my info is limited and I have corrected the posts. This is a very interesting piece of history that could be added to the SP Campaign game, but I would need more information to set it up properly. The article notes that just "prior to the out break war in 1805" Ferdinand first signed a peace treaty with France and then within a few days aligned himself with the Third Coalition. I have started the first turn of our campaign game in August 1805 because this is when the opposing factions began marching their armies to start the war of the Third Coalitions. There are three scenarios that can be modded from this;
1.) As it's currently portrayed in the SPC game, the opposing factions have declared war on each other and taken sides and the two separate factions of Naples & Sicily are aligned with the Coalition camp.
As you requested they could be combined into one faction and aligned with the Third Coalition.
2.) War has been declared and the Two Kingdoms (as one faction) have just signed a treaty of neutrality with France. The player would have to decide to stay with France or switch sides as Ferdinand did. You would have to research their trade agreements etc. so they can be set properly in the game. Victory conditions would have to remain ambiguous to allow the player to choose either side and conquer 4 or 5 territories.
3.) The Two Kingdoms of Italy are completely neutral to both Coalitions. The player can then decide what course of action to take for his combined Kingdoms.