it was the Suez that the supply terminal for the British forces so from the Atlantic you could do nothing to cut British supplies since they were coming from Indian Ocean, not from the Mediterranean Sea. Would change the war but how? I understand 'alternative history' but there a few things that you cannot change,lets take North Africa as a example. Lets me make a example, in 1939 the U-56 attacked the HMS Nelson and despite being hit by 3 torpedoes they all failed to detonate and aboard the Nelson was none other that the then Lord of the Admiralty, Winston Churchill. Localized conflicts are small scaled enough so you can make a change but in the overall theater of operations that was WW II.
