Anyway you slice it from scripture, from our confessions, from the mentioned book of church orders, From culture, and even from government wine and grape juice are not the same thing. Therefore the commanded 2 elements become 3 because man has a “better” way. I digress.
Grant, I feel like this is a bit surreal but I don't think you are really understanding what is being said. You're responding to things that really
aren't being said.
You're reading it as willful disobedience to an explicit command to use "wine" (specifically fermented). Without being facetious, I have to ask if you're really certain the
command is to use wine?
Why do all three synoptic gospels only say "fruit of the vine", a phrase (even in Greek) which to my knowledge is used for nothing else but the cup at the Lord's Supper. So the
command, as I see it, is to use the "fruit of the vine".
Now, the
practice in 1 Cor 11 certainly indicates drunkenness was an abuse at some of their gatherings, but all that can be proved from this is that at least at some of their gatherings (maybe all), they used fermented wine. But given
that there was no other technology available, all you can logically infer from the
practice is that wine was
used. I don't see how you can state dogmatically that it was all that was
allowed.
I have no doubt that the
practice for almost all of church history, was some kind of fermented wine. But that really doesn't inform certainty on the
command. Just trying to be objective here. Objectivity is not the same as defending a position.
Edit: (and for the record, I'm glad the PCA church you are in is moving in the direction of wine).