Also, I totally missed Avatar's possible rework up there, but I think it looks cool.
As for the demigod route, darvin mentioned demoting 2 would be a good idea. 6 gods, of which 3 always appear, and 3 demigods of which 1 only appears would work really well. It's less likely this way for you to spend a ton of money on preparations only to find your chosen god didn't appear this run, ruining your chances of success.