You know, it's something that should be doable and I think is working with AR and Ore. I can fairly see how it would work from a mapping side.
You could remove the Tiberium texture on the mesh and instead of the mesh type being Tiberium you could have a damage zone when Tiberium crystals are around. After saying that, not sure how much is easy to setup in terms of damage zones dependant on the amount and location of Tiberium unles each crystal had a zone attached to them.