Thanks everyone. I have a final solution.
It finally dawned on me what @ducksface was saying re: a small hole: If I just ripped off the top plastic, indeed there would be a small hole!
This is easily fillible with a bolt + pressure + sealant. So I went ahead and did the job this way. This way, the massive mounting plate which is not leaking and I just re-sealed a few months ago can stay put.
Thank you to everyone who had my back and contributed, you gave me the confidence to go ahead and get this job done. This was the "last" leak I have in my 24 year old rig, and so now we're getting ready for some great summer!
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