However... skimming through some of those, they actually look like pretty typical "work on a team" positions (e.g. "...technical guidance and mentoring of Computer Technicians with focus on accurate completion of work orders and execution of standard operating procedures..."), not "this cupboard has spares, this cupboard has rations, see you in 6 months, good luck!".

Any hints for finding something that's closer to the second option?

Trucking industry is doing well for mobile loners.

Land surveyors in places like Alaska spend a lot of time with just their backpack, equipment and rifle. I think there are still jobs for population surveys, like counting penguins/birds.

Leidos would be another company that does Antartica, satellite grounstation stuff.