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My understanding is that metallic superconductors (supercooled mercury, copper etc.) can have some net charge and still behave as superconductors. I don't know how ceramic superconductors would fair, but I think you could probably add a few extra electrons into the conduction band... I'll look into it and think about it some more...
perhaps you could be more specific as to what you are proposing to do to a superconductor. I don't think you can add a significant number of electrons into the conduction band without dramatically changing the properties of the material. I can't imagine having any sort of significant gravitational effect...