You know, having just done the matching for SSR Confidential, and especially with FK being such a small fandom with such dedicated factions, I'm really not sure if algorithm-matching would be an improvement. I ended up hand-matching SSR Confidential both years, and I know mods of other small fests often do likewise. Most of the fests that use AO3's matching also use Yuletide-style rules, where participants know that they are going to be matched on a character or pairing, but that's the only guarantee -- the prompts are optional. I don't know if that would make it easier in FK or simply be a disaster.