An army corps of "front" equivalent was out of question due to sheer logistical problems. A Guard regiment or such could be an option; a token presence in a show of inter-Allied resolute friendship. Let's say Stalin decides for this (to later, obviously, shoot or send to Gulag most of the men involved in the late Forties...) while buoying on the great decisive victories of summer 1943. When the small expedition is still being organized in the Caucasus, Italy surrenders. After some consideration, the tyrant opts for sending the small force anyway, provided the kingdom of Italy declares war on Germany - as in the end Victor Emmanuel III and Badoglio agreed to do. So, after, a long trek by train, lorries and a ship detour from Bandar Abbas through the Red Sea, suez and the Med, a Guard mechanized regiment, partly reequipped with US vehicles and weapons (trucks, bulldozers, bazookas, grenades and mortars, AA guns, a handful of tank destroyers...), lands at Naples on November 30th, 1943.