Idk man, I think this shit should be between the trans person and their doctor. We already pierce the ears and rip the foreskin off babies, and minors can get boob jobs and nose jobs already. Minors get all manner of drugs prescribed. If a doctor thinks some treatment is appropriate for a kid, okay. If it turns out to be medical malpractice we have the court system for that.
Also, I disagree that men in women’s bathrooms is inherently predatory. Frankly, this discriminates against fathers of young children because often one has to bring a daughter into the bathroom or change their infants diaper. Also, the bathroom thing is super weird, like how are you gonna enforce this in a non imposing, non disregarding of boundary way? Already butch women experience harassment for not performing femininity, and there’s news articles where nosy weirdos harass them in bathrooms…