I dont think they are that rare, you perhaps are looking in the wrong places. I am glad I dont live where you live lol. To find a stealth TS woman wont be easy. Most of us, even the very feminine ones are recognised as trannies...I have known one very pretty and passable TS, a guy followed her and said: You look really good, but I know what you are lol.
It is actually a fantasy for most of us to be totally unclockable... so maybe you should just move out of your neighbourhood!!!