The going forward for a blessing during the Lord's Prayer. I've never seen or heard of that. There's nothing wrong with it at all -- it's just not in any of the rubrics in the service books, and is not an "unwritten tradition" that I've encountered. Maybe others on the list have seen or heard of this.
I was of course referring to mainstream Anglicanism today, where communion is open to anyone with any kind of baptism, and where I have heard multiple Anglican theologians refer to the chalice as a ecumenical tool by which to achieve unity -- first share the chalice, and hope that you later come to share the same beliefs... or not.
I'm not sure what "forerunner and actuation" means -- it may be that it's what I'm about to say. The Orthodox teaching is that in our liturgical services, particularly in the Divine Liturgy, we step outside time and join ourselves to the eternal Liturgy going on in heaven. I think there is more emphasis on the "eternal now," than on the "not yet." The Liturgy starts with the exclamation by the priest: "Blessed *is* the kingdom of the Father, and of the Son, and of the Holy Spirit, now and ever, and unto ages of ages."