Do you think a Rogue of Doom could switch a doomed timeline to their session's alpha timeline and doom the alpha by stealing the doom from the doomed timeline and giving it to the alpha?

It’s a possibility, however the question here is if someone can truly Doom the Alpha, much like what Aranea was trying to do by making another Timeline the Alpha, the theory seems sound but in practise this may be a bit different. Switching their Doomed Session with the Alpha though, seems more feasible, kind of superimposing what had been going wrong on a still successful Timeline and merging the two to create a single, stable, Alpha Timeline that was always meant to be, rather than ‘Dooming the Alpha’.