These are two of my favorite games, RDR1/2 and HOI4, I had thought about creating a U.S./Mexico border centered map including all places from all of the Red Dead Games, and maybe some added fan content areas that aren’t cannon. You could play as the Van der Linde Gang in the earlier start date which would be sometime in the 1890s (wasn’t sure about 1899 since you only have months to build up resources and stuff before you have options to disband). With them you could go historical and have them disband, or get Dutch to create an American utopia like he always wanted. In the later start date (about 1910 or so) you could play as one of the sides of the Mexican Revolution, Reyes or the real government in Mexico City. If you play as Reyes you could actually experience his ride on the capital.

Trying to think of other concepts to add in if anyone would like to comment any.