Male prisons already have facilities for vulnerable prisoners.
For elderly men, disabled men, effeminate men.
What is the purpose of funnelling some men into, or adjacent to, a female facility? Seriously, ask yourself that question and then answer it.
You appear to consider incarcerated women as an opportunity to validate male criminals, including rapists and murderers.
You are using these women. Their presence in a facility is crucial to your scenario.
And at the same time, you bemoan the fact that women don't matter. Well hello!