The San'layn are unreliable to join the horde, you really have to do the alliance war campaign to understand, and then anyway they've all been exterminated by the alliance.
They have no connection with the blood elves, except perhaps to serve as their blood distributors.
The Dark Rangers are already part of the horde but they are with the Forsaken, not the Blood Elves.
This is why I find it normal that these "undead elves" are not a customization option for blood elves.
I think it is for these 2 reasons that Blizzard will not do it.

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