Just a little suggestion in the event that you do have to whistle on down in a hurry over mountainous regions-keep a rough idea of what the SAT should be at prevailing MSA and try,whilst you deal with a thousand and one other thoughts,to keep an eye on actual SAT in descent,looking for that cold weather altimetre error that could take you a little too close to the granite!!!! I dont know how much ISA variation you can expect seasonly at typical MSA altitudes over Iran/Afghanistan but descending over the Alps I usually notice -25deg at around 20,000ft. more often than not.
Route 2 updated with escape route and current diversion approach plates in view seems to pass the time quite nicely.