Barleywine
This is also my understanding of the decans. It isn't so much that the Queen of Wands takes on the energy of Taurus, but that Taurus participates in her energy and she rules his first decan....which gives her a bit of all 3 gunas. I assumed the "shadow" decan was the first decan of a sign that begins in the previous house...thanks for verifying as I wasn't positive. For me, this whole orientation works just like the tarot, and I have used it for some time without paying attention to the dates or degrees, except the ones I know from astrology. I have no problem with changing the King to Prince. He stays in the same place, and for me the guna and the house determine the energy of the court card in accordance with astrology and what I know of the elements. Unless something I read clarifies or extends my base of knowledge, I tend to forget it. For instance, as a mutable energy, the Knight stays basically the same...active and changeable and elusive. Whereas the Prince/King is fixed, dependable, and authoritarian. In order for that to change for me, the guna would have to change....and I don't think I could consider the Knights energy as appropriate for the King....but the Prince is "groomed" to be like the King....so it works for me. And I realized from reading Crowley and Wang that the Princesses/Pages are considered Earth...I have always realized from Papus that Pages are transitional cards....and the Aces being new beginnings. All in all, I don't see any differences other than the name change of the King. I like reading Crowley's characterizations because they are easily integrated with my own preconceptions for the most part, and add new facets of insight.
Regarding Venus in Scorpio, I'm not so sure she is happy because she is in her detriment/fall in Scorpio, which I think would make her very weak. Perhaps that is the down side of the 7 of Cups.
We must be on a different wavelength here. The only thing I'm not getting is how the Queen of Wands rules the first decan of Taurus. According to the GD and Thoth systems, she rules the first two decans of Aries in the "natural" zodiac, and the last decan of Pisces, running from the 21st degree of Pisces to the 20th degree of Aries. Taurus belongs to the Prince of Disks (first two decans) and the Knight/King of Swords (last decan).
I'm not passing astrological judgment on anything connected with this. My natal Venus is in Cancer, conjunct Mercury and the Sun. The 7 of Cups is part of my Ascendant profile only for the purpose of this spread, since it relates to the third decan of Scorpio and also the Knight of Wands in the GD system. There is no "astrological Venus" connection at all. The dichotomy between "appearance" (7 of Cups representing ascending degree) and underlying "substance" (Knight of Wands "lurking in the shadows" just above the Ascendant) is what I was driving at. In truth, I often come across as a typically guarded and suspicious Scorpio type on first meeting.