There was a case of a DL L1011 that went out, tried to wait out thunderstorms and winds, finally decided to make for the alternate--KBOS. Almost made it, they chickened out, low fuel, and landed 40 nm short at Otis AFB. It was back in the '80s.
Fickle finger
Not need to comply with ICAO Annex 6, just don't fly to BDA. Most competent operators, especially international, have everyone of those documents and train to the standards. Join the real world, please, others have to share the airspace.
GF