Hi there... The easier way is to export the OBJ then MDD from choreography relative to its action.
I show the process here:
https://youtu.be/PHy16vQANVA
Your work is superb. Maybe some changes in the driver to make him more relaxed, he is looking like a robot in this pose. The elbow should be away from the body with your hands more centered. Tilting the spine will also help in naturalizing the pose.
you are completely right... and it works pretty well, but the user needs another 3d software to render it,
the magic trick to export directly to Standalone Octane is to program an alembic file exporter