Valuing objectivity is, I think, more an indication of psychological maturity than linked to instinctual variant. It might be, for all I know, but in my readings on it, there doesn't seem to be any meaningful link.
You could be an sx/so and link up your Swiss-ness to Fe/INFJ and 5 wing. I know sx/so types who are situational peacekeepers; what makes them sx/so vs so/sx is how they approach the conflict.
sx/so has a "fuck it" energy, they're gamblers. If an sx/so steps into a conflict situation involving their friends, but in which they're an outsider, their role as mediator is not really going to look that way, unless they do it professionally or something. They're more likely to be "on the side" of the conflict energy itself, seeing it as something natural and maybe necessary. It really does come down to "fuck it" with sx/so, though their expression of the instinct really depends on the specifics. They might say, "Just let it go/let it be" rather than "fuck it," for example. They're more likely peacekeepers in situations they feel merit peacekeeping. A dying cause, they'll simply nudge along the death process.
so/sx has a "let's see how we can all cooperate through this together" energy; more nimble. They have a goal of cooperative resolution, but it won't appear so clinical on the outside. An so/sx entering a conflict situation would bring an amiable energy to it, and might even contribute to calming things down to a lower level of struggle. They'll inject lightness and their goal would probably be to get the warring parties involved in interaction to diffuse the conflict. In a scenario where an sx/so would feel it best if the parties when their separate ways, an so/sx would find a parting of ways to be upsetting.
sx/so: bloodletting
so/sx: dialysis
