I haven't 100% settled on where this is, timeline-wise, but I think "at least" a year before the invasion of the Solace area is a good bet. I imagine that Paladine and Gilean are not going to stand idly by, though, even if their 'canonical' pawns are unavailable for whatever reason. And, of course, there is always the option of aligning with darkness. The evil gods, after all, never left. They just asked their followers to remain in hiding when the Kingpriest got himself, Istar and much of the rest of the world pancaked.