So I need you to do something here for me: think about what you just said, specifically "'I'm sick of fucking abusive exploitative men, let's be happy, forceful (dominant), and brimming over with willpower' playthrough." Now think about where she is coming from.It's a shame the Sapphic route is rather limited. No option for women masseuses at the sex spa, had to shoot down Evelyn because her come on came with two guys masturbating over them. There's some content, but so much of it gets missed doing a 'I'm sick of fucking abusive exploitative men, let's be happy, forceful (dominant), and brimming over with willpower' playthrough. My Myriam is bi, but so over men and also trying not to be a people-pleaser, but has such poor fucking boundaries. I know there's a limit on content that can be created, but damn, this game just loves putting Myriam back into the mill (I'm in chapter 4 now).
In chapter 4 she is literally just getting done with the abusive exploitative man in her life, we can easily see Anthony is a piece of shit from basically his first line of dialogue, but Myriam hasn't seen that yet. Myriam hasn't even discovered she might have a thing for women yet, you can think that she does, because you're proscribing a back story to her. Myriam isn't a blank slate though, she is an actual character and has to discover these things about herself, and we as the player get to decide how she discovers these things.
So with that being said, there is lesbian content, it's coming for you, but Myriam starts the story as a sexually conservative straight woman. Help her discover she likes women, and you can craft her into the exact person you described in your post. But it will take time, because she is broken after her time with Anthoney and needs to find herself again.