Hi Miss Lux,
I am Asian like you, although I am 100% Korean and was born in South Korea. I moved to the USA when I was a child and am now a naturalized US citizen. I am also pretty slim, but kind of tall too, for a Korean woman... 5'7", 125 lbs. In everyday life, I don't get clocked at all, but feel like I get clocked all the time when I'm around other Asians, such as at an Asian grocery store... actually, people do not come up to me to say that they clocked me, but I just feel like they can tell just by looking at me. I get a lot more stares. Or maybe I'm just paranoid, I don't know...
Anyway, regarding Yeson, I don't know him or have gone to him, but I am very familiar with Korean culture, being a Korean myself.

So the interactions you had with his practice does not surprise me. I hate to say this about my own people, but Korean people, in general, are just rude. And they are especially rude if they think they are better than you or don't think a relationship with you will benefit them directly. I suppose this is true for all cultures, but it is amplified in Korean culture.
Now I'm kind of speculating at this point, but since Yeson's practice is so successful, I get the feeling that he's not really willing to work with people like you who have potential health issues that they feel will complicate things and/or damage their reputation and/or success rate. And again, Korean people tend to be rude and don't respect traditional western standards of courteous conduct with strangers (unlike Japanese people, who are extremely polite to strangers).
I heard your voice sample, and I think you sound very feminine. For me, my natural male voice was already fairly high (160-170 Hz), so it didn't require as much work to get it to sound feminine. Mostly I just had to work on resonance and intonation (which was pretty difficult actually). But I worked, in person, with a professional voice trainer (Liz Hearns at
http://www.thevoicelabinc.com/). Across several months of weekly private, personal voice training, I was able to achieve a reasonably feminine voice.
Funny story: after I had done my legal name change, I was calling my credit card companies to change my legal name. Some of the customer service reps kept insisting that they needed to speak to my husband or the primary male account holder, despite my insisting I was the same person. I was actually surprised that my voice passed that well, and realized the professional voice training was more helpful than I had thought.
So, what I'm trying to say is, have you tried working with an experienced, professionally trained voice instructor? It will take some time, and some money, and a lot of practice on your own free time, but I think it's worth it. And it's definitely less expensive and less risky than voice surgery. Or do you have a naturally low vocal range that makes it more difficult to train your voice without surgery?