WI: How would Germany and a fascist America carry out Sealion?

So let's the Silver Shirts somehow come into power before WW2 and align the US with the Axis Powers. Would it be possible for Fascist America and Germany to launch a dual invasion of Britain? If yes, how would it be carried out? Assume the US has Greenland, Iceland and the Shetlands.
 
Well first, you need to get rid of Canada. Once that's done, just hop to Greenland from Quebec, conquer Iceland and then conquer the Faroe Islands from Denmark. The US would be in striking distance of Scapa Flow, effectively keeping the Royal Navy focused on the US while the Germans land in England. Having the Faroe Islands also gives the US a strategically valuable spot on which to establish a airbase. Think of Okinawa during the Pacific War in OTL. The problem is, with the invasion plan strung out across different islands, there's nothing stopping a enemy fleet from cutting off supply lines, unless the US kicks naval production into overdrive and starts producing escorts and submarines to protect their ships.

The Shetlands, while it seems strategically viable, is too close to the Scottish coast for comfort and just gives your enemy another supply line to cut.
 
Assuming the Fascist America has the same industrial production potential as OTL America, it and its junior partner Germany (Hitler won't like it, but it's true) can just sit back for a couple years, spam out a unstoppable fleet after taking Canada and Greenland, then hop to Iceland and the Faroe Islands. 'Hopefully', the experience conducting other amphibious operations teaches the Germans something about how to conduct a landing, or they let the USMC plan their part of the Operation for them. I'm reasonably sure that absent that, the German part is still going to be a mess unless they get Lend Lease from America or something, giving them the landing craft they lacked in OTL.
 
Sure, kind of obviously. U.S. naval production means they eventually dominate the Atlantic and can send anything to France they want, so something like Normandy in the other direction will eventually be possible. If this fascist U.S. becomes as good at logistics and quickly building new advanced facilities as OTL U.S., the invasion through islands in the far north plans are also possible, but France is surely a better staging area and the channel isn't that hard to cross, if you've got USN and USAAF to protect the crossing instead of relying on the inadequate Luftwaffe and feeble Kriegsmarine.
 
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