I don't know if you have seen any of these 2 addons https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2864741154 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=183440286&searchtext=enhanced+pyro, where the TF2 Pyro can be face posed so that for example, the mouth of the gas mask looks like a smile and you can move the eyes of the mask to make it look happy or sad, maybe you can do something like that for when you do SAS