Yes well Wittgenstein was a philosopher and we are poets. We don't have the same empirical duty to our audience as scientists.
Arcanum? Do you mean like the 78 arcana of the tarot? Or do you mean as in the Secret - the New Age Law of attraction? Or do you mean the secret of Life and how it presents to us strange and mysterious things - appearing sometimes like 'signs' from an impersonal universe? A bit like synchronicity, but with a dark edge?
It's sounds pretty fascinating but I'm struggling to keep up. Am I anywhere near close to understanding you?
Or, is the mystagogue forever out of reach of Man's comprehension? Are you saying that only the poet can hint at it, but cannot point to it directly? Thus like 'gravity' the mystagogue cannot be seen, but its presence (and I assume its affects) can be felt or sensed?
Maybe, Wittgenstein was the wrong man up for the job? In his book Tratatus Logico-Philosophicus - his analysis is only meant to provide a groundwork for language and its structures embedded in logic - his system cannot 'put into words', either the 'mystical' or 'metaphysical' - which he says, in proposition 6.522: 'make themselves manifest'. He was after all trying to construct an argument encoded in the Logical Positivism of the day.
Anyway, good luck with that idea it sounds incomprehensibly difficult. These themes are not the easiest in the world. I would be interested if you have any more thoughts on the subject.
[For any of you who are interested - here is a one page summary of Wittgenstein's boring book. This bulletin board contains a good synopsis of the whole thing.]