Whoosh, I like your idea, easy, invisible, and no dissimilar metals.
If the hole is already threaded, I wonder if a bevel is necessary? There are a few larger (1/4 & 5/16) un-threaded holes near the base. I think I'll bevel both sides on those to get an hourglass shaped plug
The only remaining question is to fill after using the ( 30-Y-94TM Mil Spec Anti-Corrosive Epoxy) primer or before.
I think I'll prime first then fill and fair then another thin (545) primer coat.