The disturbing thought was the result of a question I asked Brandon on a reddit Q&A. I suggested using hemalurgy in that way as a result of knowing the Set's motivations and trying to think of a way of achieving similar ends that wouldn't be so evil. Also, Brandon had previously said that Sazed was against the use of Hemalurgy and I had suggested it as a implementation of Hemalurgy that Harmony might be more amenable to.
I tried digging for where I asked the question but I haven't been able to find it. So yes, it is a very "Set" minded idea.
But I don't think Spook is involved with the Set, especially since it's very much clearly a Trellist organization and Spook personally knows Harmony/Sazed. He would not decide to start worshipping another God even if he tends to think of Harmony as Sazed (human) instead of a God. When you know for a fact that your God is a good person that you like, I don't think you turn against them.
And I still think it's a 10/10 idea. More investiture++ Yay!
Edit: Found the link https://www.reddit.com/r/Fantasy/comments/1lhf1e/worldcon_flash_ama_brandon_sanderson/cbzk9vt
