From Kuntres “Koli Shema”:
Rabbi Chaim Kanievsky suggested the Gabbai search for a Cohen as Ba’al Toke’a – זכר למקדש. When they asked if there’s any point in having a Cohen as Ba’al Mussaf as well, he said no.
- Quoted by Ner Leshulchan Shabbat Yom Kippur, #583