I think you could make this work if you did the following: (keep in mind I am using the term “turn” loosely. Think of it more in terms of once the US has purchased its attacking force and is now moving in.)
Turn 1: US buys only INF. US places US ARM in E Canada onto Transports off the coast. US Transports move to Gibraltar and unload. US places FTR’s on Gibraltar
Turn 2: US has Transports return to E Canada. US has INF purchased from last turn move from DC to E Canada
Turn 3: US places INF onto transports sends transports to W Europe and unloads. US has ARM from Gibraltar move through Spain (costing 3 IPC’s) to meet up with US INF in W Europe.
A lot of times I send less ARM by transport b/c I can fit more INF. This way you can shuttle you support units before you send your bullet spunges.
Now one thing you may have to look out for is German ARM to bring the fight to you in Gibraltar making it a costly battle (@ 5 IPC per tank vs. 3 IPC per INF) but keep in mind that the Germans will loose just as much b/c they will have to bridge Spain also sacraficing an INF push.
If they do you will have to put your INF in Spain and meet your ARM and FTR’s there. yeah you won’t get the IPC’s from W Europe but you did effectively take pressure off of Russia and also make a foothold in Europe for allied troops to mass in.
LT