Expanding upon your ideas guys, I am considering using D12 dice for special units but keep D6 for standard units. Like Panthers rolling D12@7 giving them a slight edge over other medium tanks for example.
To add to you guy’s points you don’t need to use D6 with D12 dice, but the differentiation of using D12 for special units and D6 for regular units sets the special units apart IMO. It also puts a different focus on specialized units during the game.
So you really don’t need my hybrid method but I think it has potential.