I converted toyxyz's gumroad rig for Open Pose (https://toyxyz.gumroad.com/l/ciojz) to both Motion Builder friendly / Unreal friendly rigs for use with motion capture pipelines for some friends struggling with the complicated blender only rig. Download here: https://stevenharmongames.itch.io/open-pose-rig-for-unreal-unity
Overview Demo & Explanation