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α x α : 1-9
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female α : 10-11
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α x β : 12-16
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β x α : 17-19
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ω x ω : 20-21
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ω x α : 22 - 23
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β x β (in omegaverse) : N/A
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Mix of all : 24-28
so no α x ω (unless vers), no "bottom" beta switching to omega, no "beta with omega traits", and no enigma.
β x ω, male ω (top)
x female α (bot) won't be added unless they are not extremely heteronormative, otherwise it'll be too similar to male x female trans-ver. stories.
"Handsome top-like" ω x "Pretty bottom-like" α will follow the same reason, and probably added in this list of unusual tropes instead if not typical
Unconventional ABO pairings don't always mean rare-to-see tropes, and vice-versa.