I honestly don't know, and as I said, I don't have the game installed at the moment.
I do know an absolute solution though. You can always add your own one-time events to manipulate any values you wish. Simply edit one of the script files (making a backup of the original is ofc your own responsibility) to add an event set to a specific date, which will absolutely fire.
The only drawback is that events are always evaluated a turn in advance now, and their results are already implemented for day 1 of the coming turn. If the console would allow for changing some political values, they would be active at execution of the turn which you are currently plotting. The on-time event would first be evaluated at the end of the turn and it's effects set to be put into place at the beginning of the next turn.
The advantage would be that there is nothing which you could not manipulate.