Dan - Thanks very much for your detailed response and photo. I appreciate your help. I hadn't considered the Sterling alternator protector as we don't (yet) have LiFePO4 batteries, but installing one now wouldn't hurt. I worry about one of us trying to stop the Yanmar with the ignition key switch and damaging the alternator.
Do you use a current shunt with the WS500 or is it only monitoring voltage? We have a Victron BMV-700. I don't know whether the shunt for the battery monitor could be shared with the regulator (haven't looked into it).
Oliver - Thank you for your suggestion regarding using the old regulator as a protective cover. I will heed your advice.
Kevin Fox and Family
Currently berthed in Charleston, SC