I like this thread. It feels like something is being "done".
By definition, a manifesto should take the form of a set of key points - aims, policies and the like. So, we need clean and direct language:
There is evidenced harm in broadly and without question allowing people (particularly MtF trans people) to self-identify as one gender or the other. Ref: prisons, sex offenders, autogynephiles etc.
A transwomen with a penis is not a woman.
Where there is a clear need for a separate female space (women's refuges, toilets, change rooms, hospital wards) these should be provided and respected as such.
The type and use of language centred around a woman's biology, her body and and genitalia should be determined by women and not by men or transwomen.
It is wrong to encourage children and young people to classify themselves as transgender when they are in a vulnerable adolescent state and may go on to make irreversible, regrettable and damaging changes to their body.