I am not really sure how the number of apostles or the number of people at the Last Supper changes anything about the male priesthood.
Catholics also follow Sacred Tradition, not just Scripture.
We are to believe the Deposit of Faith. This is the body of revealed truth (revealed by God) in the Scriptures and Tradition taught by the Roman Catholic Church for the belief of the faithful.
Catholics, are required, to believe in all of the teachings of the Catholic Church in the deposit of faith. We cannot say, “The Church needs to change this or needs to change that.” or “I don’t believe this or that”.
So then, according to Ordinatio Sacerdotalis (Pope JPII) and Responsum ad Propositum Dubium (Cardinal Ratzinger, at the time preferct of the CDF) the teaching that the Church has no authority to ordain women is set forth infallibly.
In Responsum ad Propositum, then Cardinal Ratzinger states:
This teaching requires definitive assent, since, founded on the written Word of God, and from the beginning constantly preserved and applied in the Tradition of the Church, it has been set forth infallibly by the ordinary and universal Magisterium (cf. Second Vatican Council, Dogmatic Constitution on the Church Lumen Gentium 25, 2). Thus, in the present circumstances, the Roman Pontiff, exercising his proper office of confirming the brethren (cf. Lk 22:32), has handed on this same teaching by a formal declaration, explicitly stating what is to be held always, everywhere, and by all, as belonging to the deposit of the faith.