I also thought about the potential of harassment, but honestly, if no one ever dares to make a change, everything stays exactly the way it was.
It´s a good thing that transmen are thinking about this and fraternities becoming more open. Maybe you could figure out whether those fraternities already have non binary or transguys in them.
Agree with FTMitch though. You should thread carefully to some degree if you are trans, but that doesn´t mean that all frats have a narrow mindset.