as related elsewhere in this forum China has reportedly started studying a solar polar mission.
which brings us to this paper just published in the Chinese Journal of Space Science (abstract only at this time, full pdf normally available in a few days or weeks):
Sun Polar Probe Trajectory Design Based on Multi-objective Genetic Algorithm

As I recall, the original Ulysses concept was for 2 craft in complimentary paths sampling the solar wind at high north and south solar inclinations simultaneously. I thought (and still do) that the benefit to the mission was considerable, and I hope they might be looking at that aspect too.

yes, the original international solar solar mission was to consist of two probes, one JPL, the other ESA-built. NASA canceled its probe unilaterally (shades of ExoMars...) and only the ESA probe flew. I remember reading somewhere that European program managers regreted that their probe carried no camera, unlike the US one...