The EqA can only be changed in favour of men wanting into women's spaces if women and homosexuals' protections in law are removed. As the SCJ explained in small words.
So the govt would have to explicitly remove those legal protections and subordinate both those groups, in law, to those of men who wish to express a gender identity. If would fix homophobia and female subordination to males on the basis of sex, in law.
Not that I don't believe they are insane enough to believe this is right or to do it, I absolutely have no doubt they do, but this is what they would have to get through parliament. And past the electorate, because this is what we would have to explain loudly and clearly to voters.
If this is some kind of attempt of the SNP to be subversive as part of their never ending two fingers up to Westminster, they're failing. Westminster are as batshit as they are. It would be at this point far more subversive to actually notice and care about the half of the human race that is female. That's so subversive it's practically become illegal.