All comes down the level of abstraction you want to have in your games. Do you model engineer attachments or just agree that your company groups in the lead echeleon have the ability. Extra ATGW in a company or do you treat it as a section weapon. I think I would prefer to keep “extras” as asset cards that means then you only have to play the card and then keep the effect as shown as opposed to remembering extra rules or combinations. That way you can have period and theatre specific cards if needed.
I always like to tinker but at this level of game something to be wary of adding too much complexity in at the company level when we don’t have a Bn level of command to worry about