Honestly it doesn't need to emulate a chan. If you want to see how Quests operate, you can go onto /qst/. Quests don't have usernames, but it's one of those boards where users have IDs, so you can distinguish one from the other. For this reason, just outright having usernames probably won't be a big deal. I'm not super invested in "anonymity" in this sense, pseudonymity will do just fine.
I may or may not start another purpose-built instance for this, or just make an account on this one and repeat the posts I make on it with this one. I'll sleep on that for maybe a day or two.