See how easy this is? A priest with some amount of guts might even be able to make a change like this without having to beg a liturgy committee or parish council first. The text says it took 15 minutes to do.
"Slavery ended in medieval Europe only because the church extended its sacraments to all slaves and then managed to impose a ban on the enslavement of Christians (and of Jews). Within the context of medieval Europe, that prohibition was effectively a rule of universal abolition. "— Rodney Stark