I did further research after I posted the question and found this:
https://www.fanfiction.net/s/3000137/1/On-the-Wings-of-a-Phoenix
which is about Voldemort being good, and Harry being sort of neutral then converted to Voldemort’s side.
But it’s not the ideal of what I was looking for.
I don’t promise this will work, but I found my desire for sugar significantly reduced by trying to go cold turkey on refined sugar specifically.
It’s a pain to do, because it’s in an amazing variety of foods, but after a few weeks of cravings I found sugar desire decreased massively.