Blackandredarrow
You seem to be interested in logic, so may I suggest that your arguments fall into the "all or nothing fallacy", as described in the link below.
www.academia.edu/21565174/Fallacy_All_or_Nothing
"When people call for gun regulations after a mass shooting, opponents of such regulations often say that gun regulations are useless and should be avoided, because they cannot stop all gun related crime. No matter how strict gun laws are, criminals will still be able to get guns and commit crimes."
"But this argument employs the all or nothing fallacy in many ways. For one, when it comes to laws and regulations, it’s seldom an all or nothing affair. Lawmakers don’t expect laws to eliminate all the behavior they are trying to restrict, but that doesn’t mean laws shouldn’t exist. Speeding laws aren’t going to keep everyone from speeding, but that doesn’t mean there should be no speed limit. Laws are often merely aimed and lowering the frequency of certain kinds of behavior."
So your question should not be "is it possible to exclude all persons with a functioning penis from spaces where women may be vulnerable to sexual predators?" but rather "Does having legally protected spaces for women contribute to deterring sexual predators and reducing the incidence of sex offenses (which are mainly committed by males)?"
Because for nearly all the women posting here, that is the issue at stake, not any concern over whether we occasionally have transwomen sharing that space without us realising it.