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@Enigmatic
I realise that these comments about filler and fiberglass are in jest (I bloody hope they are anyway).
The only satisfactory repair to this is going to be mechanical (ie an interference fit collar that is heat, dropped on and shrinks into place, preferably on an accurately machined register) or a weld. To weld this properly it will have to come apart and at that point it would seem more sensible to cast a new lug with some added strength / fatigue resistance at the known failure point. This may be by additional ribs or material thickness or by the elimination of stress raisers or better distribution of stress loads through the casting.
Not something I would want to do for financial gain but something I would like to do as a little winter project in my workshop at home.