I shouldn't be bothered by making a larger hole on both sides of the remaining tang in the hull. Yyou can always fill this up later and repair it with pieces of laminate padwise.
So make room, don't go tinkering in a too small workarea.

If you have made room at both flat sides of the remaining tang, you can then problably mount two strips of metal (INOX 316) with a bolt, facing on each side. Fold the strips together above the tang, drill a hole in this and you have a new eye.

Fill the working hole with thickened epoxy and pad everything on the outside with a thick laminate.

Finally use two shackles behind each other to make the connection to the new eye. There are small and very strong ones from titanium on the market. With two shackles the wire can move more freely in every direction.

If you don't trust the strenght of this solution you can enforce it by placing two extra bended strips alongside the new eye before laminating the outside. So you anker the whole thing also on the outside of the hull.