If it's any help, I've found that stealth is really a dream if you remain in the same town. Gossip gets around. Nobody has treated me like anything but a guy since transition and I know I didn't pass in the beginning, even though people were politely calling me "sir". But 5 years later it's like a fact that people remember, but don't really put a lot of emphasis on.
One of my clients' mothers, who I've never met before, turns out to know my gf and she was saying something about her son's lawyer, Dennis. My gf said "he's my partner and I know he does the best he can for his young clients". First thing the woman said was "Dennis, used to be Denise? How's that work out?" Barb said "fine, thanks" and that's the last we heard about it.
I was employed by someone else (who was a great employer) and then struck out on my own a year after transition, and I really don't know who knows. Nor do I care. I think that's the secret is not caring whether people know or not or what they think. Hell, they could know you from your past drug abuse, or your transition, or any other small-town stuff. You are who you are and you should be proud of what you've come through to get to be you.
Dennis