Very interesting question! Now, to reality: only one German commerce raider made use of the NorthWest Passage with the aid of the USSR.
From my Chronology of World War Two in Europe:
July 3, 1940 – The German auxiliary cruiser Komet sails from Gdynia. Soviet icebreakers accompany Komet through the shipping route north of Siberia into her East Asia operational area.
September 5, 1940 – The German commerce raider Komet reaches the Pacific Ocean.
This trip through ice would be an almost impossible event for a U-boat.
Let us know if you're able to do it.
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