Not sure how this would work or if it would be worth it but here is the premise.
This assumes UK lost all navy aside from the DD+transport. UK purchases 1 destroyer, 3 transports, 3 inf, 1 arm. Placing it where Germany air cannot sink it.
On US one they place 3 of there fighters in Eastern Canada, purchase a carrier, another fighter, placing there 4th starting fighter on the new carrier. Also, purchases a few transports + units to shuttle.
On UK2 they purchase a carrier and other fleet elements to protect the transports, and units to drop next turn. All units land in France. Italy cannot retake it on there turn. On US2 they can land 5 fighters in France, plus 2 more units and prepare for the next turn drop.
This gives you at the end of turn 2 10 potential units plus 5 fighters on France, making it borderline impossible for Germany to retake if there going all out against Russia (i believe). Then you can just continue to shuttle over troops until you can take a capital. Japan would get beast but Russia should have some fight left in her to help out. This would work even better if a large amount of UK fleet elements survived turn one. Even if you decide to abort (if Germany keeps units back) you can hit Africa with the US fleet and pursue a general KGF. If you afraid of Italy destroying to many units with a counter attack you could even do this on northwestern Europe.
Good idea or terrible? Cant play till this weekend when I plan on trying it out.