It's relatively easy to pass as any gender, age, race or whatever you want to. Yes, it will be more difficult if you call your account Transwomxn or request that people use xe/xir to refer to you, but if you're SarahKnitting, everybody will just assume you're Sarah and into knitting and will use she. At that point, it might be the right call by the community to not accomodate those that want to focus their membership on their political identity so they can provide a friendly community about knitting for the SarahKnittings of the internet.