I'm quite taken with the idea that you might write it. There's moments in Good Omens with the description of Adam that has hints of this.

And yes, the sacrifice is an act of love, on the part of the victim, not Pan. Pan should be completely indifferent, in the same way as a chef would be indifferent to a steak or a tin of beans. He does this because he always has and because it's his right, it's the order of things.