Actually WPATH doesn't really require anything. (So a surgeon doing it all in informed consent, no T, and no therapy is acting completely within WPATH, and so is one going totally by the letter.) WPATH all a matter of recommendations and has no legal standing whatever. If the insurance wants to require T, therapy, or anything else it can require it. You can try to influence them but legally you have no leg to stand on.
As insurance starts covering surgeries, I believe we might expect more hurdles. Sorry to say.
--Jay