Hey guys, I found the answer to my question.
For anyone else wanting the answer, just use the hyperRealMeshParent.mel tool by Erick Miller. Its basically like the rivot script you find on creative crash but so much better, it will work on joints, clusters and other deformers.
Here is a website that you can use as a tutorial and where you can download the script:
Its at the bottom of the page (week 8).
Thanks a lot for your help!