An even easier way to get the Okri challenge "Old Fashioned Learning" done for Warrior Priest of Sigmar

Ok, so the reason I am making this guide is because I was trying the "known" ways to get this challenge done myself and I ran into some issues. Mosty that the locations mentioned in the other guides were very exposed to special skaven that would incapacitate me even after getting the challenge done. I know skill issue. But I tried a few things and what worked for me should work on any difficulty and even wothout killing off the bots.

The chosen map is Screaming Bell. I had a Deed with the "Send In The Next Wave" modifier for this, but I imagine with enough patience it might work without it as well. I set up my bots with the starting gear and removed anything that might increase their damage. Choosing weapons with low attack speed could be a boon too. Then I made my way to the location of the second grimoire on this map.
For those who don't know, once you get to the townsquare with the statue in the middle, the wagon with a ladder next to it as well as some scaffolding, that's the one.
Then I did the climbing and jumping required to get into the hole inside the scaffolding to get to the grimoire, pulled the lever to open the gate to make it easier for skaven to flood the small space and got into the small space to the left of the door that just opened. I moved all the way back and that was enough for the skaven to stop attacking but they still piled up on top of each other and luckily the Bot AI also didn't attack. So I waited a moment for enough skaven to accumulate, did a light attack against the wall and did the overhead charge attack into the skavenpile.

That's it! No need to kill Bots. No need for other players. No need for enough skill to survive incapacitating speacials.
Keep in mind that I did no further testing on this because I was just happy that something finally worked. But hey, if the common method also doesn't work for you it's worth a shot.

Good luck!