As Jenny has said, traches come in all sorts and sizes. And some women do have larger ones.
If you lift your trachea to cut the resonance in your voice to make it more feminine sounding, that will lift it higher in the neck and make it less obvious. So learning how to speak with a female voice actually does help hide your trache.
The only other way to make it less obvious is through tracheal shave surgery. I never had one that big, but having it shaved did quite a bit for my self confidence.
-Sandy