My small contribution: I have no experience whatsoever with the TG issue, since this is a brand new dilemma.
If I have to use some guideline as reference I will think about homosexuality and the few individuals male and female that I saw coming into the WT with the conviction that they had conquered their orientation problem. There was not a single case where they were successful, in every instance they went back to their old habits or practices and some of them took another publisher with them.
My opinion is, a person with that inclination will be asking for hell by coming into the WT.