I think time would pass incredibly slowly for an observer that close to the black hole? Since the event horizon provides a singularity where time slows to zero,

I think time would pass incredibly slowly for an observer that close to the black hole? Since the event horizon provides a singularity where time slows to zero, it makes sense that any non-zero speed along it would go to infinity for an outside observer. I doubt you could usefully exploit this behavior, because any charges would still need to travel to and away from the black hole at no more than light speed, and because time slows down the further you get to the event horizon the shortest path "around" a black hole would probably not go through it.