Good lol, that is less embarrasing, but its still true, there's always some piece of hidden information that makes me feel like a noob almost on a daily basis lol.
Yes I think an editable bulletin board would suffice for what the OP is asking, and could fill the "recruiter npc" role too technically, if it had the space to do so (within the dialogue tree), would there just be one though? Would it be possible (or worth it) to clone it across a few more popular towns so that any edits made to one would be shown on the others?
Having just one is fine if it is in a place like the hub, but if you are going to the effort of making it, make it highly visible in some way, it is a small but very useful feature to have in game, wouldn't want a blind ass like me walking past it for years thinking it's scenery.