A few general points.
This is not a political issue. It is a societal one. Most everyone was caught napping when Stonewall added the T. Most of us thought Stonewall was a force for good, only to find it was using its influence to peddle something few people support.
It has become political because the views of some political parties are out of line with those of the general public. Rishi, to his credit, is not capitalising on this. Labour are digging their own hole. The very best outcome would be for Keir to think hard about the impact on our children, on women's sport, on academia and free speech etc, and offer to work with the Government to reverse the damage. Labour has huge influence on Unions, large swathes of Local Government and others. A societal approach is needed.
If you contradict people whose reality is different from your own, you are likely to cut off communication rather than achieve a constructive outcome. There is no quick fix in schools. The first step is probably to quietly roll back on affirmation only, review educational materials and outside trainers. Then to ensure that educators within schools are up to date with thinking including Cass findings (very much where we need Labour on side, we don't want gender to be perceived as a political issue in staff rooms). Then agreement that kids caught up in this are supported but nudged in the right direction. Is there something behind the distress that might be addressed like an autism diagnosis, social services involvement because of suspected abuse at home, a chat with parents to understand where they are coming from. Even a favourite teacher encouraging them to join a club, and leave the LGBT one.
Headteachers will need guidance on what the Government expects as the direction of travel and the promise of support should they end up clashing with their staff room activist.
It would be so much easier if Keir could recognise the scale of the problem and the importance of us all working together to protect our children.