Love the "double-exposed" image — it names something I've felt in practice: the Harris/Crowley image stays perfectly legible, yet a sidereal undertone quietly re-colors what the card is doing. Your Emperor example is the one that sold me: Aries authority read with a Piscean undertow becomes less the conquering general and more the priest-king, which honestly feels truer to how authority actually initiates people. On augur's caution about reworking Magick — I wonder if a reader could capture most of the value without rebuilding the system at all, by treating the sidereal shift purely as a second-opinion layer: read the card straight in the tropical/Crowley framework first, then ask "what older stellar current is haunting this operation?" That keeps the Tree of Life as the anchor (as you suggest) while giving the precessional backdrop a real seat at the table. Have you tried reading the same spread both ways to see where they converge?
