Given the nature of the event and fact items are related to a person I think it'll be a case of we get a special non-wearable firecape from an npc somewhere. Like we might go see Jack at Lunar bank and get Cyrisus' Firecape or perhaps Kuradel will give us Duradal's firecape kinda thing. I'm also of the opinion that they don't want to lock anyone out of visiting dead npc's, so they're not gonna keep you from meeting Duradel just because you don't have 99 slayer