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The easy all around answer is that if you have to build something as a custom item the answer is no, especially a magic item.. The black blade does not exist in the books as anything other than the archetype description.
There's generally no need to build the item with custom materials, given that as the blade evolves you get various ways of getting around DR, such as converting the blades damage type to elemental, charging it up as brilliant energy, etc. and of course the raw plus value.