Please correct me if I’m wrong, but unless Japan has attacked UK and therefore DoW the USA, American units cannot end their turn in SZ 54. I like your idea to send the UKBB that way instead of just having it die with the rest of the UK fleet defending SZ 39, but in any event, if J1 DoW, then the American units are likely dead, and if not, they cant end their turns next to ANZAC or UK territory. Right? My only point is that getting to move everything and all nations to SZ54, intact and at war, would be rare.
Another question;
UK can declare war on Japan at any time,
but, the ‘tripwire’ of DoW on UK/ANZAC bringing USA into the war if attacked unprovoked is lost
UK would get its bonus (since it would be intact and whole in every event that it could declare before Japan does)
but the downside is that USA would not be at war with anyone, and not get its bonuses, until USA4.
(The old disadvantage is that USA’s +20 bonus for the commencement of war would also be lost, but that is a 1940 Pacific rule only)
It would appear that this is an bad strategic move, since if UK DoW UK1, Japan could take most or all of UK territory without having to worry about any American attacks or about any substantial American bonuses early on coming into play in the Pacific.