The chances are that, for anyone who is looking for a real answer to this question... there is...
NONE!
If you venture into the developing world without company procedures for departure, I feel sure we'll all read about you in the fish wrappers. If you don't want to feature in there, along with 200+ pax who trust you, don't go to those places if your company doesn't already have an OEI escape procedure.
There are lots of folks like j_t who can provide the necessary expertise to keep you (and your 200+ pax) safe.