3-4 rifles + mortar + medic + captain + stuart.
Go Calliope commander, equip LMG's on all your rifles. Enjoy killing Mg's frontally and wiping inf.
On early play agressive but mind to be in green covers. after upgrading with LMGs push forward, you will beat any inf you find.
Your soviet mate should cover you in AT. T85's + mark works fine (mines and Zis for mid game).
PLaying that way you force the axis to stay in a deffensive role, here is where the Calliope will end the job.
Very interesting idea of splitting up responsibilities into Anti-infantry and Anti-tank, we have never tried something like this. Will give it a shot.