If you’re working in that genre I’d like to see a “James/Lily survive” but through their own intelligence and foresight rather than magical coincidence. And no “wrong twin who lived” parental abandonment either.
My one-line seed prompt would be “James, this is stupid. Why are we trapping ourselves like this? It’s like we’re the bait for that bastard.” Said Lily one evening after putting Harry down for the night.