The problems are multiple as you well know.
Often they are not clean. In fact I've never seen a clean gender neutral toilet. They are always covered in pee and stink.
The 'common' area is away from the public gaze if the cubicles are housed in a separate room which many have to be in old buildings, making women feel more vulnerable because they are more vulnerable in that situation.
Especially for Muslim women it would be highly inappropriate for them to be in a secluded bathroom area with men about.
Many women simply wouldn't feel comfortable in that situation and that is reason enough not to share with men. Plus obviously the ease of illicit recording of women is very real. If men can spend time in unisex facilities setting recording equipment up because no one can question why they are there, it again makes women more vulnerable.
I don't know why you are asking what women should to to make transwomen more comfortable. It's not women's job to find a solution.
Plus and again as you know there is a very very easy solution, a third unisex bathroom alongside single sex facilities. But TRAs never want that. Their misogynistic ideals involve trampling all over women.
I don't know why you are posting a link (source info cant be seen without registering anyway) to attacks on trans people). Again it is not for women to give up their hard won rights to appease other groups or make them safer. Women have their own safety issues.
Have you posted elsewhere or spoken in real life about the number of women dying at the hands of their partners or ex partners? If not. Why not? You expect women to solve the trans problem. Why aren't you out solving the rape and violence epidemic against women?
You are marginalising women by expecting them to put themselves at risk. You are expecting women to give things up for men and to centre men.
You are the problem because you won't listen to what women say about their needs and wants.
Women are human, not props for men.