Lets presume we can get away from the idea that we have to identify a particular firing stand and target stand, but can deal in groups firing and targeted. That means that dummy stand might stay unidentified for a bit longer, since one need not exclude particular stand from those identified to the enemy as firing.
Megablitz has a nice idea where you total up your combat dice and hand them to your opponent, who roles them and secretly applies the results. I'd like to extend this a bit to differentiate weapons fire. So, I might determine that my 88 at 1500m gets a "red" dice. Having rolled the dice, the target player organizes the results - so a red dice rolling a 4 might score a major results on a T/34 stand but no result on a JS2 stand. Results would be secret, and might or might not involve a visible result for the attacker; likewise, the exact firing stands might or might not be revealed.