Yep...I had thought of demoing that but it is kinda tricky and you do have to clean up after yourself...but it's a good solution you have come up with–kudos on finding it on your own!
Thanks, Jeff. High praise coming from Zeus himself! When I discovered that the vc snapshots were in the master's xmp, the light bulb flashed. This suggests that the develop settings for a vc may also be stored in the master's xmp, but I cannot find them with LR or ACR. Are they there, and if so somehow accessible?