Julia, the examples you cite are nothing but extremes. The State Representative who says "where does it stop" and an org such as "Massachusetts Family Institute" claiming gender inclusion restroom laws permit and/or encourage child molesters to use this as a ruse to commit their crimes are really no different than opponents of gay marriage when they say "where does that stop? Next thing we'll have is family marriage, underage marriage, polygamy".
Do you really think the likes of any org such as Massachusetts Family Institute will line up behind the TS cause if they feel there is no connection or concern with "child molesters"? I think not. They apparently used such hyperbole to kill the gender-inclusive restroom usage portion of the bill you are talking about. I'd bet the farm they'd jump on another bandwagon to deny you rights all the same were it not for the existence of such low hanging fruit.
Changing of a gender marker on an ID is reasonable with medical certification of some sort. What's wrong with working WITH your legislators in order to create good law? Do you expect them to do it on their own? They already are proving a level of perception detrimental to your cause.
And I thank you for conducting yourself the way you do, just as I'm thankful for my transitioning and transitioned friends who do the exact same thing, not eschewing the similarities within our community and representing us all.