Read a great article on this board a week or so ago:
Orthodoxy and its discontents
The author consistently refers to Transwomen as 'trans feminine people'. I really like that, and intend to start using it!
It's accurately descriptive, focusing on gender identity rather than sex. It doesn't misgender, but doesn't coopt the word woman. It avoids the awkward speach pattern of MTF, FTM.
Language does matter: it frames viewpoints and influences law. Could we start using that phrase, and start trying to get it adopted?