Yeah Big Meteorites are only slightly better than the Rock Meteorites, though they do contain byproducts too, and you can always crush them or at least hammer them on an Anvil. 
As for the Ores, why do you exactly want to disable them all in the first place? Did you not just wanna get rid of the vanilla ones?
And Copper is technically a vanilla Ore by now, ever since Mojang added it in later MC Versions.