So what if I replace Tetisurah with a 10th level version of Sebti? Brings her back into the game, reducing the troubles of having flying cavalry allied to the party.
Too much of a stretch?
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That would be strange. There would be a lot for you to add to reason how she got there, and why the cult of the forgotten mask would even be interested in her. Tetisurah herself is merely there because she's this desert's local guardian, and the cult wished her out of the way. Why would Sebti be in the parched dunes? I'm not sure about your party's interactions with Sebti, but for mine, it's only the events in book 2 as well as a minor touch in book 1 due to Neb-At messing with her crocodiles.
It's your call though, I'm not sure how much of the world has been altered due to player interaction, it could work. Off the top of my head I don't see why Sebti would take it upon herself to go alone into the parched dunes when after seeing the PCs defeat the Vanth, it's clear that the PCs are more capable.
As for flying calvary, sphinxes are aloof, and Tetisurah is clearly more interested in protecting her desert as the quest the PCs are on should they describe it, clearly involves leaving the land she has a divine stake in. I'd wager she could accompany them for awhile, but not outside the parched dunes.