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And i would like to answer my own question. it came to me as i wrote down that the two nodes have almost exactly the same costmap/params. The global_planner just comes with it's own costmap. All i had to do is to load the exact same yaml-file together with the global_planner. And as expected: the node complains and doesn't calculate a path, but it stays alive and you can just enter a valid goal and the planner will than give you a plan.

Maybe this can help someone trying the same as me :D