Taking it even further (and more absurd) the interface between the heliosphere and the interstellar medium (ISM) lets in matter mostly along a curved path at the bow who's size and orientation is defined by the relative magnetic vector orientations of the heliosphere and the ISM. This was a recent discovery by the IBEX interstellar neutral atom monitor. If you could get the artificial magnetospheres to influence the magnetic field around the region in the bow where this happens (by controlling the magnetic field in the plasmoids your artificial magnetospheres sends off with the wind) you might be able to control the direction interstellar neutral atoms come in at. And that'd allow you to apply arbitrary (small) force to the entire heliosphere and control direction over very long time periods. But that's so back of the napkin I doubt it's actually feasible.
Taking it even further (and more absurd) the interface between the heliosphere and the interstellar medium (ISM) lets in matter mostly along a curved path at the bow who's size and orientation is defined by the relative magnetic vector orientations of the heliosphere and the ISM. This was a recent discovery by the IBEX interstellar neutral atom monitor. If you could get the artificial magnetospheres to influence the magnetic field around the region in the bow where this happens (by controlling the magnetic field in the plasmoids your artificial magnetospheres sends off with the wind) you might be able to control the direction interstellar neutral atoms come in at. And that'd allow you to apply arbitrary (small) force to the entire heliosphere and control direction over very long time periods. But that's so back of the napkin I doubt it's actually feasible.