I got a idea. Return us to our regular government selections, BUT with a twist.
Hear me out. How about you can choose your government, but depending on what policies you choose(Like say you take yourself as the head of the religion in that nation), you can make yourself something like a theocracy, or mix up communism and democractic traits and make a Socialist Democracy?
Or how about this, a custom civilzation maker? Choose the color, the flag, the leader, and the special unit and building?
I've been wondering whether Civ should include a "cabinet" that the player can fill up with politicians/aristocrats/bootlickers of their choice to help them run the civilization. These people would replace the governmental systems and grant bonuses based on their personality and political agenda. Mismatches (like a "rich businessman" and a "fanatical cardinal") could create friction in the government of course. Of course, rival countries may not like your government that much either...
Examples of politicians/aristocrats/bootlickers
Religious figures like cardinals, druids, bishops (boni to religious cities, wealth, increases friction with heathen civs but improves relations with bros of faith)
Military leaders like warlords, knights, generals (decreases military support costs and gives free promotions with possible happiness and culture penalties due to rule with an iron fist, possibly could include something like drafting if the military party has a majority in the government)
Businesspeople like merchants, land owners, bankers (more money, obviously, and perhaps additional boni like happiness to cities with busy markets and penalties for poorer cities)
Civil rights activists, communists and egalitarians (more food, higher health and happiness but costs more money to keep up and incurs the wrath of the business party)
Cultural people like philosophers, writers and artists (more culture and possibly research, happiness, but they hate the military party and vice versa)
Technological incluencers like engineers and inventors (more research and production but may penalize cities without universities for example and cause a lot of friction if coupled with religious party)
So if I wanted to raise an army quickly, I would give the military party a high representation so their policies can help me create an upkeep the army, and once the war is over, I sack the warlords and hire a couple of left-wing politicians and inventors to run the state with me.
It is fundamental in this idea that each representative is an individual. They can be replaced, and possibly be assassinated by the enemy nations, and they may offer [dis]advantages other than what their "class" normally does - a bishop could be interested in starting a crusade and thus share many traits of a militaristic representative, while a general could have a firm interest in researching new guns for his boys. A businessman could be an art merchant and therefore offer culture boni, and so on.