What I'd really like to see is an extended dialogue between Barfield and C.S. Lewis, which I know actually happened because Lewis alluded to it in his famous description of Barfield as his "second friend." There's a book of Barfield commenting on Lewis, and that may be the next stop on the tour.
One of my constant questions would be what Barfield would make of the analysis of DNA words that I'm thinking about right now to reconstruct the ancient words. On the one hand, that's exactly what he did with English words, and he argues at the end of Saving the Appearances that evolution and Christianity naturally cohere. On the other hand, English words are a way of looking at the human mind, while DNA words are not, because these words were never formed by the human mind, and there's also that little bit about Barfield saying the past "never happened." But this passage near the end of Worlds Apart finally resolves it for me:
"Brain, heart, liver, spleen have been built into your body by the world, by the whole history of the world, and if you 'study' one of them in that intensive way, you have access to the relevant period of world-history. Access, first of all, to the building that was going on before your birth and, through that, back into their remoter phylogenesis."
"You see -- or at any rate I have argued -- that if evolution has indeed been fundamentally the evolution of self-consciousness, there cannot be that sharp break between ontogenetic and phylogenetic development, which the positivist picture of evolution assumes. The one must merge gradually back into the other." (p. 195-196)
Of course, right after this high point is when the book really goes off the deep end, with too much Steiner and too little anyone else. (Maybe even too little Barfield!) However, that part is written as a collection of unconnected observations, almost like appendices, and so I think even Barfield saw some of that as outside the necessary argument he was making. I'm starting to separate the wheat from the chaff here and I think there's a way to adapt some of the ideas of Barfield in a way that takes the good and leaves the bad. In particular, I think Tolkien ultimately did that and such an adaptation accounts for some of the strength of The Lord of the Rings. Is there a way to do that with the data collected by current biology rather than the ancient Norse sagas? I'm not sure. Stay tuned.