You make it artificially complicated because you are trying to make a point and I'm not playing that game.
Totally not what you make it to be. The real process is:
- conquer city
- step down as duke
- make yourself lord of the new city
- create a new duchy in that city
All the other crap you list is not essential to the goal you list. You are overcomplicating a process that is inherently very simply. I don't know if you haven't understood the new system or if you're just being dense. But half a dozen people have tried to explain things to you, all of them have no trouble understanding how things work. I'll simply stop at this point.
You can't do that if you're the ruler of a realm.
