There's a delightfully hyperactive weapons vendor who visits Warwick Homestead periodically.

Her name is Cricket.

Does anyone know if it's possible to recruit her as a Trader for Settlements?

No

I have here (and the doctor) visite the castle with the "trading point" * i crafted wto make caravan from bunkerhill come here. Got lucky it was her and not the armorer vendor.

*Dont have the english translation for that construction sry.

Cricket is the one trader I'm glad to see and talk to, even when I have nothing to buy or sell. I helped her out on several occasions with the gunners in Quincy Ruins.

We need a mod for Cricket as a companion. I hope she gets a part in a DLC.

I don't understand the trading post object you can build as I get the 4 Bunker Hill / travelling traders (Trashcan Carla, Lucas Miller, Cricket, Doc Weathers) visiting some of my settlements anyway.

I built the trade posts in the ones I have seen them visit just because.. it makes sense now?!?...

But yeah, they move around and can be found in your settlements, on the road and in Bunker Hill...

The traders seem to have set routes they travel, each one only coming to certain settlements. Carla, for instance, I see nearly every day at Sanctuary. After building the trading post, Carla, Cricket, Doc, and Lucas have visited Sanctuary - sometimes two at a time.