How might a civilization artificially keep a supermassive black hole electrically charged for the lifetime of the black hole?

A civilization creates a supermassive black hole with an electric charge such that the radius of its inner horizon is 3/4 the radius of its outer horizon. In nature, a black hole with this much electric charge would be neutralized by particles of opposite electric charge falling into the black hole. How might this civilization artificially prevent such particles from getting into the black hole in order to keep the black hole significantly electrically charged for its entire lifetime?

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How might a civilization artificially keep a supermassive black hole electrically charged for the lifetime of the black hole?

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