Good Muspelli?

Sure, the possibility is raised in Rival Magic, on page 81. The real Muspelli-equivalent patrons that were sketched, however, went with monstrous children of Gaea instead of the Twelve Titans.

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There is Tasgilia's tradition in House Tytalus, the "Titanoi" (HoH:S p.74 and p.94f), who initiate (TMRE p.75ff) Hermetic Theurgy.