Is the existing ball head on my tripod sufficient when coupled with the move shoot move wedge?
MSM: Yes, you are right. That will be sufficient using the existing ball head + wedge. The wedge should be mounted to your tripod, as it could help you to fine-tune the setup for a precise polar alignment.
Then you could use the existing ball head to connect the camera onto the move shoot move rotator.
Please check the setup as follows,
If you are interested, please check the move shoot move wedge for astrophotography here.