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I continued with the experiment of filling in a countersink with JB Weld epoxy. I sanded the epoxy down until it was flush with the surface and re-drilled the hole through the middle. I countersunk some .040 sheet and riveted to my experiment. It seemed to work out well. Just to be sure, I drilled out the rivet head and separated the two parts. The epoxy held up well. The picture shows the drilled out rivet still in the holes.
I went on to fill in my accidental countersinks in the stiffeners. I also dimpled around the edges of the forward bottom skin.