Yes, including males in women's spaces no matter how they choose to identify will end up excluding some women - so not really inclusive at all,
Unfortunately, I don't believe that the left cares if women are excluded. You might find a few who are swayed by that point, but I suspect that most of them would secretly be thinking, "if you're scared of penises while you are naked then just stay away from those places you bigot".
I do not have a link but something that used to be passed around whenever the topic of persuasion came up, was a page which talked about 'how to get people to agree to something when they don't really want to'. Basically, you get them to agree to the principle first.
The inclusion argument doesn't really work as a starting argument because it becomes obvious immediately that in this debate, two sides are directly oppositional to each other and one is going to lose. So arguing with a transborg that "their side" should be the one to lose out, is not a persuasive argument that you want to lead with.
Lead with something that is far easier to get them to agree to.
A good, and uncontroversial, starting point would be to point out that sex is a protected characteristic in the Equality Act not gender. Gender reassignment is a separate PC.
Although that one appeals mostly to those authoritarians who equate 'legal = correct' it would still make a better starting argument, as is the one about, "women are allowed to set our own sexual boundaries". It is REALLY super difficult for the transborg (the difficult to convince people) to deny the reasonableness of those two arguments.