Correct me if I'm wrong, but aren't nuclear-density collapsed matter stars exclusively zero-net-charge neutron stars? I suppose you could instantiate an "oops all protons" neutron star with a charge of 10^54 coulombs in Universe Sandbox, but I struggle to imagine how that would come to or continue to exist physically.

More importantly, I think that the Coulomb's Law repulsion effect would more than cancel out the gravitational attraction effect - both laws work as Force = (constant x particle1 x particle2) / distance^2, and the electromagnetic force is much, much stronger than gravity at all distances.