I would agree that in France I would say "on-deev", but if I am addressing
the produce boy at Safeway, he reads "n-dive" and will have an easier path to finding it for me. So, in America, (as in Rome) do as the Americans do. LOL
I am always amused by what my pronunciation of the famous brasserie in Paris is in my mind--Bofinger. . I try to do better when I am speaking of it in Paris.