I don't know why they don't just look into brain transplants. Take the whole female body (TW could look at a nice glossy catalogue and choose the style, colour, design etc, a bit like choosing a new car) and then the brain could just be implanted into the "new vessel". After all, they already HAVE "lady brains" that like pink and lipstick, so it'll be easy.
Of course, a source of female donors will need to be found, but I'm sure a nice breeding centre could be set up somewhere isolated, where female "donors" could be raised ready for implantation. I'm sure there will be an island somewhere that could be taken over. There will need to be "incubators" to raise the first donors - I'm guessing these could be female prisoners who meet the requirements (scaled on attractiveness, intelligence, hair colour, that kind of thing) who are carefully matched with male inseminators who would obviously be paid handsomely for the job. I mean, lord forbid they aren't rewarded for their breeding lines.
It worked for the Man With Two Brains, didn't it? Dr Huffufffer or whatever his name was. He just implanted a female brain in a female body which was his big mistake...