Do you think a particularly ambitious Witch of Hope with incredibly intense amounts of belief could modify reality to the point of altering an entire timeline? Related to that, would a transfer of classes from Heir to Muse and Witch to Lord be feasible?

Changing through their Beliefs is something a Witch of Hope would be able to do- But the extent of said Change and its influence are debatable. What kind of change to the Timeline? If it’s merely swaying the events one way or another, that could certainly happen. If it’s got to do with Doomed and Alpha Timelines, and predestination, you’d need a bigger Deus Ex Machina to pull it off.

Also, as I’ve mentioned in the past, I don’t quite agree with the concept of switching Classes or Aspects noticeably, like- Call it Roleplay, call it Inversion, but all the shows of Classpect-switching we’ve seen are temporary, and tend to be rather unhealthy, so I find Classes and Aspects so deeply rooted in people that permanent changes like that would go against their very base nature. But who knows!