I don't accept your premise. Where you look for exact word for word translations of defining verses Catholicsm looks to the words and versus within the context the entire Gospel and Tradition of the Church. Where you look for either / or decisions, Catholicism sees "both / and".
I accept on faith the teachings of my Church and faith is the belief in things not known or not knowable. As St. Thomas Aquinas said; “We can't have full knowledge all at once. We must start by believing; then afterwards we may be led on to master the evidence for ourselves.” [but] “For those with faith, no evidence is necessary; for those without it, no evidence will suffice.”
There is no contesting that the early Church saw the Liturgy of the Eucharist as something more than symbolic and saw the Eucharist as the Real Body and Blood of Jesus. St. Thomas Aquinas did not invent transubstantiation, he simply articulated it. Likewise the Eastern Church applied the Greek word, "Metousiosis". It was a taxonomy of ideas, not the invention of concepts.
The idea of the change in the substance of the bread and wine did not come into being with the development of a Latin or Greek word. It came into being when Jesus said; "For my flesh is real food and my blood is real drink." (John 6:55)
Peace be with you
Well, where do we go from here. You don’t accept my premise? You’re the one touting your hapax legomenon. It’s not my fault it doesn’t prove your case. Lexical analysis is what it is. It’s not my premise you’re running into here. It’s just ordinary knowledge about words. Kind of a common framework that has to be there to have any continuity of analysis, of which, as you must know, Aquinas would approve as the exercise of right reason.
As for John 6:55, surely you understand that real and corporeal are two different words. Words have meaning. God is real, right? Is God corporeal? Well, to a Mormon perhaps. But my Bible says God is a spirit. Does that make him any less real?
Look, I respect your effort, but I don’t see where this can go if you think we can just throw aside the rules of language whenever it suits you. From a debate point of view, you put me in an impossible position. I have to accept your entire system of belief before I can inspect it? Really? Like ObamaCare? We have to pass it before we can find out what’s in it?
Not how I play. God saved me from a wretched life. You have no idea. There were miracles. I have seen the name of Jesus put flight to the darkest evils. He reached me through his word, and I will not sell out low for 9th Century magic, not when I already have the real real thing.
Peace,
SR