GJ,
When I fly over Iran we are provided tailored escape routes for each segment of the route. It is a continuing exercise at every route segment to select the appropriate "bail-out" route. The routes are listed in our Jeppesen Airway Manual, and are in our FMS database.
I imagine that our company pays a significant amount of money to have Jeppesen publish the routes for both the FMS and our Jepps. Even with these routes, we still carry additional oxygen bottles because of the length of time we would be "stuck" above 10,000. In some areas we can only get down to FL170 for a bit of time.