My question concerns the theory proposed in this classic paper by Misner and Wheeler. In the paper, the authors propose the idea of "charge without charge"--namely, that positive and negative particles might really be the ends of a wormhole, with field lines going into a mouth interpreted as a "negative" particle and the outgoing field lines at the other end as the "positive" particle.
However, I noticed that the paper didn't mention whether or not the wormholes were traversable. If the wormhole was not traversable by an external material source (i.e., they have unstable inner horizons, have curvature singularities, etc.), then could the field lines technically travel through the wormhole's neck, or would they, too, be blocked? I know that the "charge without charge" idea isn't probable due to the tiny wormhole tunnels collapsing to form black holes, but my question also concerns larger wormholes as well. Thus, could field lines travel through a macroscopic non-traversable wormhole?