I'm inclined to agree - perhaps honesty is the best option here?
Of course, don't burst into the interview in full female mode and utterly confuse them. But mention it to them if you get past the initial interview stage. Perhaps mention it when you talk to the HR staff, who might be far more understanding. Or wait for a while until after you've started the job and settled in, until after you've proven yourself a good worker and an indispensable employee.
It's a tough choice, but unless you know for sure that this company would absolutely not hire you because of your gender issues, then it's a choice you're creating and not a choice which is being imposed upon you (if that makes sense.) And it's a fair conclusion, given the fact that there are still plenty of people out there who just don't understand and who would gladly pass over a qualified trans candidate in favor of someone who is more "normal".
But give them a chance.
You might find that the employer "gets it", and they realize that your performance at work has nothing to do with how you present yourself physically. They may be very progressive and accommodating. They may surprise you. There's plenty of horror stories on this site about getting fired for coming out at work, but there's also plenty of stories about how generous and kind employers and co-workers can be too.
I absolutely get the practicalities of keeping the female side hidden. We've got to put food on the table and put a roof over our heads, and often that means hiding the girl inside, painful as that is. In many cases, the job simply has to come first. That's how it is for me and many others, but we manage - most of the time!
And there are ways to compartmentalize all of this - it's never easy, but you can have separate lives at work and outside work. While a full and permanent physical transition might be off the table for the immediate future, you're only at work for 8-10 hours a day. There's plenty of time left for who you want to be outside work, especially if you take care to ensure that your work doesn't encroach into your personal life too much.
You might see it as a black and white, on or off situation, but perhaps it isn't. There are shades of gray in between, and compromises that you can make that will give you some breathing room until you're better situated to transition permanently.
I truly hope all of this works out for you.