The adam's apple may not be such a problem. Many GG ladies have reasonably large 'adam's apples'. The voice, well I have a deep liverpool accent but I keep practising. It also depends where you are. I presume you are in the USA, I think gender laws change between states, in Australia where I am it is illegal to ask an employment question or discriminate (except on special circumstance and there are few of them) on sex, gender, religon, age etc. And if a person thinks they have been discriminated against they can put in an appeal that has to be heard by an independent body (not always in private industry BTW). And yes it is quite easy to discriminate against an interviewee without them knowing.
Can I suggset an alternative thought train? People want people who can do the job. Jobs are tight so the employer wants the best for their money. It is up to the employee to demonstrate that they really are the BEST. As an employer, I 'obviously' don't have a hang up on gender or sexulaity. BUT I will still reject anyone who isn't the best for the position. If a TG comes to an interview with me, their gender is as irrelevant as if they were a green eyed martian. I want the best.
So, practice your CV's, practice your interview techniques, make sure you present well, make sure you put forward your skills. Read the books about interview questions and have the answers ready. In an average job application I get about 100 CV's I get rid of 90% in a 30 second glance of each.
From the 10% I may select for interview I can assure you that half of them will not know the company profile, what we do or who are main clients are. Sometimes the internet generation should learn to use the internet

. And I'm in a very specialized area

.
So as far as I'm concerned Tristan V that your gender is not that important. Your job skills and experience are.
Good Luck
Cindy