I'm a little confused about your situation. If people are reading you as female but you ask them to use male pronouns and/or you have a male name--is this the case?--then you cannot be stealth in any case. Even if you are still going by female pronouns and name, I don't see how you can keep people from talking. I can see that it's maddening to be outed to people who haven't even met you, but, honestly, you cannot control what people say. You can ask your boss to tell people to keep a lid on it, but that doesn't mean that they will.
I am in a situation that can be quite uncomfortable for me because I still teach at the school where I transitioned. The staff and my colleagues seem to be pretty discreet about it all--as far as they seem to be concerned, I'm just me--but there's always a chance that someone will mention it to someone who doesn't know, and I'll be asked about my past. I've been consistently read as male for...let's see, nearly four years. I came out at work only months before I started "passing" consistently. Even after all of that time, I know that the subject might still come up unexpectedly.
I don't work in a small industry as you do, so I know that our situations are not the same. But I try to be philosophical about my situation, and I figure that when sufficient time goes by, it will not matter anymore. I keep telling myself this, and I grind my teeth occasionally, but I know that I cannot control other people's conversations. It sucks, but there it is.