Regarding the idea of sets and subsets, I think it could be argued that there are subsets within the set “women”. You could categorize women into subsets with different eye colour, for example.
But those subsets have to have an overarching category to begin with, which requires that we have a clear description of the category “women”.
I would argue that blue-eyed women and brown-eyed women are all subsets of the overarching category “women”. We all understand what a woman is as sex is a concept we have all grown up with.
But if you try to include some men within your category “women” then the category “women” becomes meaningless as it has always referred to a sex category, of which there were two versions: women and men.
How exactly are you moving “men” into the category “women” is the question. What makes those men “women”? In what way are they different from other men? Unless you can explain how those men are women, then you have rendered the category “women” meaningless.
And regarding the matter of employment, I don’t doubt some trans people have difficulty finding jobs. Others, however, have benefited from male privilege for many years, then transitioned late and are thus ultra privileged when compared with women. And I was interested to see a comment on the RollOnFriday article linked here recently. It stated that there were some organisations and professions where trans people were over represented, and that some of those organisations were very powerful. I will append a screenshot of the comment.