I think of SX/SP as a stacking that unites art and business behind the scenes. You've read of it as the "tattooist" which is dead on. Here I want to add some archetypes of my own that are also rooted in professions, everything aimed at giving you a sense of what SX/SP's purpose and function in society might be.
Given how creative they can become without social restrictions, I'd dub the stacking as the haute couture
designer. Or fashion consultant. Increasing someone else's or your own attractiveness to get by, it's not so much about adaptation here. It's very one-to-one flowing into self-preservation instead, standing out while taking care of yourself. SX 'electrifies' to make money with SP.
SX/SP as a designer makes sense as far as their hidden position is concerned. During fashion week you only see the models, the creator only shows up for like 2 seconds at the end. Social last is compensated through your public work in the form of SP: the fashion items itself, the economical contribution to the industry aka self-pres going to social. SX/SP also can think outside the box of culture. That's why they can be innovators by chance unlike the social stackings that are deliberate. They can effectively ignore competition to do their own thing. Though who knows, it can become their downfall if they are forced into the life of a socialite, or make a faux-pas which is bound to happen. You know how Karl Lagerfeld - definitely Social last - is. Genius with a pen, trainwreck in interviews or on the red carpet. SX/SP does best doing the work without much commentary because it drives people away. That's why I emphasize the behind the scenes aspect so much, exposure spoils the majority of their potential. Think of SP/SO and SX/SO, exposure does the exact opposite, making them appear in a good light and fostering their agenda with ease. Meanwhile, SX/SP's forte is still the self-preservational stance where they rest in isolation, as weird as it sounds. The social stackings, SO/SX in particular, will do the rest for them. Again, it's that one person they rely on, but essentially they want to aim for work as an occasional hermit:
All this might also work for the profession of an
architect. Not the real-estate agent, SO/SP and SP/SO do that. It's about the design again, art and business backstage. But this is already very close to SP/SX.
For equally strong SX and SP I'd suggest
barista as the overarching idea. You have to deal with your own niche, one person at a time. Those people are busy with themselves anyway, lots of SX going on. The barista SX/SP makes sure that the SP-lasts won't burn out
Again you have SX intensity covered and you are a provider, all with an artistic slant.
A final note: The single most important factor in their function/career/lifestyle is that this stacking can stay in a small circle.
It's crucial that they have a counterpart everywhere they go to depend on. Otherwise, they are lost. Especially when the eventual spotlight goes on, which they should avoid in the first place. This stacking's not meant for working the big stage at all. Again:
SX/SP symbolizes haute couture for selected people, not prêt-à-porter for everyone.