Thanks everybody for your help so far, I got it to work!
as suggested by @manuel I removed all nvidia-dkms related packages including bbswitch-dkms and the downloaded nvidia driver just to be sure. I then ran
sudo nvidia-installer -b
After this i still got the same error so I decided to just try modprobe nvidia and this worked! I then followed the rest of the tutorial by installing optimus-manager-qt disabling bumblebeed.service and enabling optimus-manger.service
Well at least a to some extent…
I got Optimus-manager installed and can switch between the all different options and they do work so that’s a fantastic start!
However, I am facing a slight issue with setting up my 2nd monitor. When in hybrid mode I don’t get an image whatsoever and while nvidia-settings does show it, there is no way to configure it. Additionally xrandr shows it as disconnected.
When set to Nvidia the second screen gets detected and I get set-up everything with xrandr.
So how can I get the 2nd screen to work in hybrid mode? I know this is technically possible because it worked just fine under Manjaro KDE.
I’m using just I3 at the moment so configuration without GUI’s is still something rather new to me