What if Paul's inscribed audience, "brothers" (Gal. 3:15 and 4:12), is taken in its literal sense: not "brothers and sisters", but rather, males assigned male at birth? Thus:
"There can be neither Jew nor Greek ["brothers"], there can be neither bond nor free ["brothers"], there can be no male and female ["brothers"]; for ye all are one man in Christ Jesus." Galatians 3:28, ASV [augmented]
In this rereading, Paul was abolishing males becoming female. Is this plausible as a reconstruction of the original sense of the statement: "there can be no male and female"?