IIRC, a Johns Hopkins study found precisely the opposite. Or, at least that many who had undergone a portion of the "change" (top and/or bottom) were unhappy, and wanted to change back to where they started before reassignment.
But the process is not reversible.
A number of British studies have exposed the same trend....unhappiness after the whole game had been played out.
I think the key element of success is that once you’ve had all the operations...you need to continue to have mental health professionals in the middle to convince you (in a fake sort of way) that you are now different. As long as they stay in the loop...you keep thinking that you are different. Once that element is removed, you resort to asking questions and realize that your change was just a joke (on you).