>>4754682We have made recent advances in gene therapy that can turn ovaries into testes and vice versa.
There is a viper whose venom damages the pituitary gland of people that survive, which is known for actually causing people to reverse puberty (they don't lose height or get younger or anything, but men lose muscle and stop growing facial hair, women lose their curves, etc)
There are microfracture surgeries where doctors are tricking bones into growing longer (to repair damage that doesn't really exist) to extend legs and stuff.
This is all pretty cutting edge stuff, so it likely wont be put to cosmetic human use for years, but it is looking pretty plausible to create a series of drugs and surgeries that reverse your current secondary sexual characteristics to take you back to 0, followed by switching your gonads to produce the hormones to start puberty over on the other side of the fence.
With the microfracture surgery stuff, there is even the possibility of giving MtFs wider hips, and possibly do something about the shoulders, though other things like hands and stuff are probably not worth the effort.
Granted, there is still stuff that doesn't cover (you still have to have roughly the right body type, and the whole genitals thing still requires normal SRS) but this is all technology that we have right now, at least in early stages. Its just that it isnt in human trails/applied to sex changes purposes yet.