Oh crab, so I basically have to wait until SKSE comes up with a solution. The script is based on a quest and I can't fire a spell with it, I assume. Turning off player controls or not doesn't seem relevant to me.
But wait, maybe I could add a perk that has the magic effect of slowing down time and once the script/quest is done I could remove it.
Thanks for linking me into the direction...

Edit: Got it. I just made a copy of the Slow Time Spell, changed it to an ability, lowered the duration to endless. Once I add this spell the time runs slower and I have enough time to get through the Menus.
Thanks for your input friends.