There is at least one person circumnavigating without using any motorized transport. https://www.youtube.com/channel/UC-bqpGT7rVPJ-CEEdFIeTDQ They do mostly mix between sailing and cycling. With this one it is more about the interesting people and places and not just the trip, so no strict rules on land or sea travel. But they do strictly follow the rule of not using motorized transport so getting in and out of port can be interesting, often they need to get help from the locals to paddle in and out.