I would buy a 1/4" tap and a matching round head stainless screw. Tap the hole, and coat the screw with epoxy. Screw in from the outside. Will hold permanently, or until you grind out and fill.
There is a very good epoxy putty that is sold in stick form and you just cut off a piece and mix the core with the outside and stick it into the hole like chewing gum and it will be thumbnail hard in ten minutes. Trim it with a sharp chisel and sand it smooth.
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