Let's say you're an American Indian.   I'm white.   And I write you a letter, saying that on behalf of all white people, I'm sorry for what whites did to Indians.

Would that make you feel better?

The Church, including 3 Popes and who knows how many bishops, have already apologized ad infinitum for the abuse.   I don't see how more seeking of more apologies and an official church Bureau of Apologies from 3rd parties to faceless parishioners helps anyone.

What WILL help everyone in both the past, present and future is to stop relying on the Church to police itself.    What will make the church police itself is reliance on courts and law enforcement to police the church and force it to be vigilant against abusers.