@Metaright "The way to sway a pro-lifer, then, is to demonstrate that a fetus doesn't have personhood."
No, first you have to persuade them that the life of the fetus bearer is worth something more than being an incubator.
Which you will never do.
People who are anti-abortion fanatics may or may not believe that a fetus is a baaaaaby, really. But what they really do not believe in is the personhood of the placenta owner.
And until you find a way to convince them that a real, living, breathing human being with feelings and rights who already exists independently has rights, including that to life unburdened by an unwanted pregnancy for any reason, you won't convince them of anything else.