what if public companies are related to hamlet defense? An NPC like linkpearl would be perfect for this. Imagine, a hamlet gets attacked by a horde of beastmen, you get a call on the public company pearl to lend a hand.

I don't think an npc like linkpearl is all that bad of an idea. There are a million different ways they can take it. Don't start complaining about something we have no idea what it entails yet.