Obviously after posting this thread I immediately found these two threads:
Surrounding the target
Stop radius calculation for group movement
They gave me the idea to set nodes to not walkable where my enemies will go into a “locked” state, which should change the pathfinding behaviour of following enemies to another route to the target. To accomplish this without destroying the whole plugin is what I will start now.
But I would still be glad if someone would come along with a great idea! 