I try to look towards board games for ideas of how to handle mechanics in MU*s. Pen & paper RPGs is where our hobby was mainly birthed and draws the RP culture from, why not utilize the other side of the tabletop game hobby to inform our mechanics rather than trying to borrow from Crusader Kings, Civilization, etc. Our format seems much more suited for the simpler mechanics that board games have than the spreadsheets of computer strategy games.
I mentioned Republic of Rome in another thread as one game that has an interesting political premise. There is Twilight Struggle and it's mechanics for spreading and combating the spread of influence. Medici is a pretty simple and fun economic trading game. Pit is too. Pandemics, Dead of Winter, Forbidden Island, Shadows Over Camelot, etc. all demonstrate how to handle group management of limited actions and how to present a crisis needing organization with simple mechanics. A few of them also show how to keep a traitor element from detailing the game and instead snaking it more fun.
Now obviously just importing a game with no changes wouldn't work, but using these games as inspirations and references rather than trying to make Europa Universalis but with more roleplaying might be the better route to take.