I mean, honestly? I don't see an issue with Chris getting SRS if that's what he wants. I think the only real dangers would be in the aftermath. His piercing got infected, likely due to lack of care, and I just don't think he's got the chops to tend to something like that after the hospital releases him. Add that with the state of the house and it's a recipe for another, far more dangerous infection.
Were he in a different place, like in a little one bedroom apartment on his own with maybe a home health nurse to visit him to make sure he's keeping clean? Sure, why the fuck not? Not hurting anyone and he'd likely have to go through the whole gambit of a psych making SURE he's got dysphoria, and enough dysphoria to justify the surgery, not just "I like to wear skirts and have long hair".