Possibly the Italians could have used the French ships to help keep Rommel better supplied. Had those convoys had better protection who knows what might have happened. This would have been a short term fix because the Brits would have filled the Mediteranean floor with those ships in due time.
Still maybe that fleet helps Rommel get more tanks, he reachs Alexandria, makes a German presence in a supportive Jewish loathing Middle East, then moves to make contact with supportive Iraqi forces. Now established in Iraq the Germans and Mid Eastern allies push east and invade India. This coincides with a Japanese attack on the other side of India. Now linked the Axis powers surge northward capturing all of Europe and Asia. Russia is removed.
As Japan builds forces and focuses solely on the US, Germany finally launches Operation Sealion. Facing Hitler without the help of Europian allies Britain falls. Japan hits Alaska with a diversionary force then over runs Central America. At the same time Germany invades eastern Canada. Facing a two front assault America falls. The Axis claims victory on G34.