Trans people have exactly the same range of sexualities as cis. Some are gay (meaning attracted to the same gender), others straight (meaning attracted to the opposite gender), bi, ace or pan.
Sexuality isn't gender.
Surgery on under-18s is banned in the UK. The vast majority of trans children don't so much as see a counsellor, and have to cope alone with gender dysphoria. Feeling unsafe at home can push them over the edge at a time when they also have to cope with growing up, peer pressure and huge exam stress.
Conversion practices are never anything other than abuse, and many abusive, controlling parents have severely harmed their children under the guide of 'converting' them.
Anyone who's ever made an NSPCC or social services referral regarding child abuse (I've done it three times to try and help families suffering DV) knows that basically nothing happens - a case is opened and then closed, in most instances. It takes so much for a parent to be prosecuted. The idea that police and the social will be swooping in on parents who don't 'affirm' is ridiculous. They barely turn up when you're burgled.
Conversion therapy is state-sanctioned torture, and abusive behaviour from parents - ostracising, verbal abuse, isolating, controlling, forcing them to deny their identity - should never be excused. No parent is entitled to control their child.
I can see you're concerned for trans children, and thank you for your kindness, but the biggest danger they face isn't being trans - it's the violent behaviour of other people. They need their parents, because feeling you cannot trust your guardians is intensely traumatic. I'm so pleased to see this is finally being addressed, and the abuse loophole closed.