The tenancy to end when a resident male child turns 12
I think this is a big stumbling block in the plan. Whilst it sounds a great idea in principle, in practice, it's designed around deliberately making mothers and children homeless - which is never a good look.
Imagine being an 11yo boy who learns that you, your mum and any siblings are going to lose their home because of you - and not because of anything that you've done, but because of the actions of a large number of adult men. Your neighbours, who only have daughters, can stay as long as they like; but you and your family are forced out of their home. Ironically, this situation could be a fertile breeding ground for incels-to-be.
Something like the female equivalent of Mount Athos could theoretically work, but in most societies, neither sex lives in a vacuum - and the fact that children exist, and obviously can be either sex, make this unworkable in reality, imo, anywhere where there is any possibility of children being born.
Also, unlike women's toilets and changing rooms - where an adult male should never be present, unless he's a cleaner with the requisite warnings - people's homes aren't that straightforward. Most tradespeople are men, so every time somebody needs a plumber, electrician, builder etc., there will very likely be men in the building - men who, if they were that way inclined, could have an easy way of getting in amongst a whole load of single women, without there even being any decent men there to stop them. It wouldn't be difficult for residents to end up having a tradie boyfriend 'working' in their house indefinitely.