Just my opinion
If it's the plug, the engine needs to come out of its hole to replace. If it's not the plug, all other possibilities that result in losing all oil with the engine at rest involve the pan which also necessitates pulling the engine up and out of its hole.
I don't see any way it can be avoided so the sooner the better. It sounds like a lot of work but it really isn't. Shaft, fuel line, water hose, exhaust, cables and wires, maybe two hours round trip.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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