Firstly, the girls usually aren't any happier to be recognised in public than you are. If they see you out and about, especially with your wife, they will duly ignore you and hope you do the same for them. With that in mind I guess you could keep face mask on, but I wouldn't worry greatly about concealing your identity in the room.
I've never been to SBM but I have been to Top Ryde, which I think is a sister shop, and the girls have always been lovely as has Cherry who runs it.