So my first question about the wicker-wise is: in what sense is "Inflict 2 Harm upon another, unwilling, with no
benefit of armor" a "sacrifice"?
I mean it might be a sacrifice, if there's no one around you want to inflict 2 Harm on. But it might also be a direct-damage attack on an enemy that you don't have to roll for. Is that the intention? Indeed, this "sacrifice" might be the primary effect you want out of the charm, in that case.
You're facing an enemy who is wounded but will yet see another sun rise. He's wearing armor; you're tied to a tree, and he's drawing a bead on you with his longbow from 20 paces away. So you just do something random -- charm the peasant girl watching from behind the bush to fall in love with a sparrow in the tree above her, but only for an hour or less (the first sacrifice) -- so that you can do 2 harm to your enemy, past armor, as the second "sacrifice". Bam. The enemy drops dead, and you wriggle free of your bonds. Charming the peasant girl was just for amusement value, to watch her desperately woo the sparrow as it hops from branch to branch. The "sacrifice" was the real point of the action.
Note that the enemy in question could be a PC, who you just offed, and you didn't have to roll for it (so there wasn't even anything to interfere with, if the game had interfering).
Is this the intent? Or is it the intent that the sacrifice be an actual sacrifice -- like, "inflict 2 Harm upon an ally, servant, or friend, unwilling, with no benefit of armor"?