Trans people engage in more variation than that, actually.

I nearly said something about the concept of genderqueer in my previous message, which would have been to the effect that it's an alternative to the trans route rather than something that includes it.

Not all have the same motivations.

And yet "gender dysphoria" (which is the wrong name if gender is a conventional construct) isn't on your list, but from what I've read and heard seems to be the primary motivation for reassignment surgery.

The general point I'm making is that dissatisfaction with conventional, socially constructed ideas of gender cannot explain the whole transgender phenomenon.