This comes back to the sucessfull Allied deception efforts. The Axis are going to be scanning the Med & seeing a fleet waiting to pounce on Italys coast. As miserable & economicaly failing Italy was in mid 1943 it is probable Mussolini will lose power before the end of 1943. With France the priority the Tunisia bridgehead may not be eradicated as per Our Time Line. The Allies may as well run that campaign as a economy of Force operation and allow the Axis to think they are winning. Even let them reinforce the Tunisian front. In march 1943 there were what, six Axis armored divisions in Tunisia? Let them remain there until after France is invaded. Once the Allied lodgment in France is secure a amphibious fleet is not required there. In the autum of 1943 amphibious transport can return to the Med and run further operations there.