The pope has always had the power to overturn excommunication. Also, personally, I think all priests should be enabled to forgive all abortion. Having said that, I'm not the pope; I leave such things as the mechanics of this to the hierarchy of the Church. And, so, I have no need to comment.
The sections which relate directly to your disagreement with the Church are in the two prior sections, which state unequivocally that abortion is wrong ... you skipped over those sections. I've reproduced them again below, since you seem to want to avoid those sections, and selectively guide the discussion elsewhere (to the mechanics of forgiveness [Church discipline], away from the morality we are discussing [Church Doctrine]). Care to comment on these sections which state unchanging Doctrine? If not, how should I interpret your silence?
2270 Human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights of a person - among which is the inviolable right of every innocent being to life.
2271 Since the first century the Church has affirmed the moral evil of every procured abortion. This teaching has not changed and remains unchangeable. Direct abortion, that is to say, abortion willed either as an end or a means, is gravely contrary to the moral law: You shall not kill the embryo by abortion and shall not cause the newborn to perish.