They tried to make a game which takes from Eruopa Universalis country management and Crusader King character focus already, it's called Imperator Rome. Didn't work
Have you actually played the current version of Imperator Rome?
Imperator has a bad reputation for its terrible release version - which suffered not only from being barebones in fluff and nation-specific content, but also from questionable design choices and just being boring and too easy. It was improved more dramatically than any Paradox game by patches, and has many design ideas that are both conceived and executed really well. To name a few:
- the army system with a tradeoff/transition between levies and professional standing armies
- a food and supply system for armies
- a system of cultural acceptance with actual interesting strategic decisions
- fluffy, fun, interesting religion, where you pick your main gods from a pantheons, can build, conquer and desecrate holy sites, distribute artifacts...
- the best tech system of any Paradox game
- a pop system that was neither too complex nor too simplistic, that felt relevant and organic and that you could interact with meaningfully.
- the distinction between settlements, cities and metropolis which gave you actual interesting, meaningful options for developing your provinces
- a mission system that may not be perfect, but that to a certain extent adapts to the in-game situation, makes you choose a general strategic direction for your country and that combines flavourful nation-specific content with dynamic, non-specific content
Yes, the game even in its most recent version still lacks flavour in several areas, the AI is still so bad that it is not challenging enough in singleplayer and lots of stuff still should be improved and further developed. It is a crying shame that its development was halted. EU5 could still learn quite a bit from it.