Hello, looks like we are also cousins. I am also related to Eugene Porcheron anf Olympe (my grandfather's grandparents). We know quite a bit about the family. Eugene was the first Mayor of Noumea and there is a street named after him there. I think he was born in Nemours in France. There are still some Porcherons in New Caledonia if you want to track them down for more information.
Drop me and email at adam(dot)lenevez (at) gmail(dot) com if you like
Adam