We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
You could make a copy of your iron man save and try it out. If it doesn't work you can go back to your old save.
Your saves are in documents/paradox interactive/crusader kings 2/save games.
Just copy and paste your save elsewhere. If you want to revert back to your old save paste your old save back into the save game folder.
Edit: I suggest trying out the new council mechanics on a random new game if your current playthrough is important to you. Sounds like the council mechanics have a bit of a steep learning curve.
It should be fine on a technical level, but when I added Conclave to a game that was already in progress I defaulted to a fully empowered Council instead of an extrapolation from my preexisting Crown Authority and couldn't do anything.