First point, hypothetical questions are hard to answer reliably, because imagining yourself in one situation is one thing & finding yourself into the same is quite another.
Second point, one facing the prospect of such a situation could seek advice from a priest / spiritual father. I can speculate what answer a traditional priest would give: don't accept this job offer, try to avoid the assignment, resign if no other solution. Think about your soul first & trust God will provide the rest His way.
Third point on personal level, if I was forcibly parachuted in such an area, I like to think that I would go to no church at all. Unless I was also chained & thrown into a dark dungeon, I would try to engineer my escape back to civilisation as early as possible. If it was, say, a 6-month assignment, just wait for the time to pass.
Fourth, for people gifted with good organisational skills - one can try to get in touch with other Orthodox families who might be interested in getting together on Sundays for prayer & fellowship. It's not unheard of for people to search pages after pages of the phone book trying to locate a greek / russian / serbian surname for that purpose! If 2-3 families like that can get together, then that's a small community already. Perhaps once every few weeks they could organise a trip / excursion / retreat to the nearest place with an Orthodox church. Perhaps they could request from the nearest bishop to send a priest to serve them once or twice a year. Whole communities are known to have sprung up out of nowhere like that!