My solution is duplicate the skeleton, rename it properly, then create IK rigs for both old and new skeleton, then do retarget for all the animations. I would recommand to do so with 5.4 or higher, since the retargeting gets way better than before.
My solution is duplicate the skeleton, rename it properly, then create IK rigs for both old and new skeleton, then do retarget for all the animations. I would recommand to do so with 5.4 or higher, since the retargeting gets way better than before.