Barleywine
Fine work, Barleywine. I tend to think that putting Pisces at the High Priestess would be somewhat of a problem, though. Pisces is a sign of endings, or sorts. As the last sign it has all that has washed down over the year, so it has a little of everything, I once heard an astrologer call it "the garbage sign" (but in a good way!). Point is, it isn't very energetic, it probably wouldn't have the power to hold up the Priestess's duties high up there in the Tree. Also, being there would put its entire neighborhood out of sorts.
I like the idea of having the spiritual moon emanating from Keter, its best qualities; and the actual moon down below, and as you mentioned Crowley it really it a sort of lackluster, polluted card. Not the prophetic visions of the HP, but meaningless dreams and fantasies you can't trust.
I've thought about this some more. Aeon's comment gets to the heart of what I was saying about not wanting to "wreak havoc" on the Tree. But my comment about "throwing out the books" has some relevance too. My astrological vision of the Tree has more to do with Greek Hermetic philosophy than Hebraic rabbinical classicism, I guess.
Regarding Pisces, although I'm "devoutly non-religious" (one of my favorite oxymorons), I got going on "Christ consciousness" and the idea that the channel for Christ's manifestation and "repatriation" would have been from Keter to Tipharet and back, and Christ's was an eminently "Piscean" individuality, while Pisces is a sign of service and sacrifice. Rather than collecting psychic garbage (or at least not concentrating and holding onto it), the Piscean path at its best might be seen as a way of transmuting, purifying and sublimating it. (I hear the Pisces types out there cheering ) Also, I kind of take issue with the "last sign" notion; astrology is perfectly circular so there is no "last sign." Pisces dumps all its waste right back onto the head of Aries. Or how about this: "The High Priestess (Pisces) makes the Emperor (Aries) 'lick her boots'." More cheering!!!
Also, in this life the principle value in the Tree would seem to be the Way of Return; thoughts on emanation come across as just that: an abstract mental exercise, however edifying and elevating. Leaving Tipharet by way of Pisces strikes me as a perfect expression of leaving the grosser aspects of the Ego beyond to continue the ascent.
Finally, back in the '70s when I first encountered Crowley's allocation of the modern planets to the Sephirot, I never liked putting Neptune in Chockma because it just seems too feminine to represent the Father. The deity Uranus, as "Father Sky" and father of Cronus (Saturn/Binah), and the planet Uranus as the modern "ruler of astrology" seem to make more sense as a replacement for the Wheel of the Zodiac.
With no argument about Pluto at Keter, that left Neptune to Da'at, which seemed to immediately resonate, since Neptune is an obscure and nebulous presence, "now-you-see--it-now-you-don't" kind of thing. Coincidentally, Pisces is ruled in modern terms by Neptune, and having Pisces on the path crossing the Abyss at just this point makes loads of sense to me. I like the "mystical" feeling of the combination. Also, the Moon as the astrological expression of emotions, moods, routines and habits doesn't have much of a "higher wisdom" dimension to it; it's more about urges and flows, a "tidal" presence in our lives.