What on earth will your goal be in EUIV, when all those Miroslavs start fighting eachother? Which Miroslav will you even play? And what about when countries... stop being Miroslav? Won't be easy getting a new one on the throne!
I think it will be highly entertaining to try and preserve the great Miroslav dynasty against the tyranny of democracy, war and revolution. Not only that, but managing the power dynamics of each nation will be gratuitously fun. I will most likely play as the Serbian world Empire, since that's who I started with and they're the head of this illuminati. They have 1.5M gold banked, control a massive Empire stretching from Iceland to West Africa to Bangladesh and have a gratuitously large force of nearly 540,000 men and 6,400 ships at the ready. What was it, during WWI where practically all the monarchs on both sides were related to one another? Unlike them, I would seek to use my incalculable resources to do the impossible and maintain this family's hold on the world, instead of being lost to the marching feet of plebian facists, communists and liberals.
Despite the Serbian world Empire being so powerful, her success will multiply the difficulty of surviving through the new age. Serbian philosopher kings distributed technology, built up the economies of all conquered lands and supplied ample gold to developing empires to the point where even the once-shitty pagan wastelands of Russia are raking in big gold, and every single nation (including the Zoroastrian Ferzadid family ruling in Turkestan) will convert into the western technology group. Couple this with the already fuckhueg Empires and the High Americans of the Aztecs and Incans... This should be one explosively fast and violent game of Europa. The Serbian world Empire is strongest, but there are already six other Empires who can challenge her.