sort of an answer
@jonny Disclaimer: I do not have an answer that is *specific to* this situation, so I'm drawing from general 'community management' practices here.
Going off the general question of "what attracts the intended target demographic", if I had to do this, I would probably focus as much as legally allowed on "here is what accommodations and safeguards we provide [that are of unspoken specific interest to these people, and likely to scare off toxic dudes]".
It doesn't *prevent* anyone from applying (so I expect that it wouldn't run afoul of legislation, but I am not a lawyer), but it does clearly communicate that there is a culture which is friendly towards the intended demographic, and hostile towards the "discrimination doesn't exist" folk, which is likely to include most men, which results in self-selection.