No A/T is no 3B, 3A is fine and it's still easier than flying the classic but less rewarding.
Depends on the operator and their OpSpecs. We cannot do Cat 3 without autothrottle.
But, it appears that oceanic airspace may not be allowed due to entry requirements of 1 FMC. (Please provide a link to show this). Would it make sense to consider a re-route further north onto a Russian Route in order to continue and perhaps refuel in Sapporo?
You made the statement, so maybe you can provide the link...
Per our FCOM, an FMC is required for CPDLC/ADS-C operations and/or for entry into Class II Navigation airspace.
How long does it take to get overflight approval and an entry window for a Russian route?