AH Challenge: A Viable Ikarus

Operation Ikarus was the German plan in WWII to invade Iceland. The plan wasn't realized for many a reason, not in the least the death of the sea-mammal-that-must-not-be-named.

Your challenge is to make an Operation Ikarus that would be viable to the German leadership and actually carried out. It's OK to have the Germans be crushed within a few months by an American invasion, but what would such a plan look like, and what would the combat be like?
 
Wouldn't this be completely impossible to even attempt? I mean for Sealion:D, at least an attempt (landing 1 or so divisions before being eaten alive) is possible given really favorable conditions for the Germans. For Icarus, I doubt that even an attempt would be possible, let alone hanging around till the Americans arrive.

The most I can see is landing commando troops by submarine, but there's no need for the German HQ to even think of doing that.
 
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