There was an suggestion in the old forum by Milocat for the T-43 that was quite interesting; link is here: https://old-forum.warthunder.com/index.php?/topic/542839-t-43-medium-tank/. It might benefit from a bit more discussion and sourcing here, as there still seems to be some ambiguity regarding its armour (if someone wants to make it a formal suggestion that would be great). Also, it seems that there’s both a 76mm armed and a 85mm armed version. It would be nice if we could see both in game.