Dumping more and more mass into a black hole until it holds a whole universe is, apparently, not enough. But, hey, isn't it lucky that there is now also an unobservable dark matter and energy and just enough of it to make the 'gravity only' sums come out right? Hmmmm.
Does this really sound more plausible to you than that widely separated bodies in vacuum, large and small, can hold charge?
Keep reading your high-school textbook on physics and be sure to note the equations on calculating the force of an electrostatic charge over very large distances.
If you rubbed the entire galaxy with a cosmic-sized cat you still wouldn't have the effects you're postulating.
Does this really sound more plausible to you than that widely separated bodies in vacuum, large and small, can hold charge?
I hope you are kidding.