Before even starting to consider if it is at all possible to ethically medicate children with these side effects and long term consequences, and it is entirely without consent because we have a number of adult detransitioners sharing their experience that they begged for this stuff as a short term immediate desired solution and had no idea of what they were doing to themselves, and that they should have been protected from the lifetime regret and damage they were helped into?
Adults with direct skin in the game should not be in any way involved. At all. This is about the children's best interests, not the desperation of adults to use those children to meet their own needs and confirm their own beliefs. Particularly when those adults have absolutely zero capacity to engage with anything but affirmation of their beliefs because of their own vulnerabilities, are not able to neutrally consider the issues, and normally abandon on the spot any child they have championed if that child ceases to be helpful to their needs by detransitioning. (Interestingly they also often fought and fought to say that the child's feelings, wishes and impulses should be absolutely respected and obeyed if the child wished to transition, while denying that it's possible to influence a child towards a decision that isn't right for them - but if the child's feelings, wishes and impulses change to wishing to detransition, the same adults will often deny, ignore or dismiss them, and blame the detransition on failures of others to properly support and affirm. Only SOME feelings are right and only SOME wishes matter. And you cannot miss that the categorisation is linked to the helpfulness to the adult.)
These are issues raised by whistleblowers from years back.
To the OP's question: It's a double bind.
No drug should be prescribed without proper clinical trials, done by the book.
Is it possible to ethically do a clinical trial on these drugs with children? It's very unlikely to ever pass proper, ethical and medical standards.