Could you bring back cartography from legacy so we can tell others about thingwalls they haven't visited, it could require effort to produce one map (I'm imagining visiting a handful of quest givers in the province you are mapping, might be hard to directly work this into the crafting mechanic, it could be that using a new hearth magic spell "eagles eye" perhaps starts a quest for the province you are in, on completion you get a thingwall leaf tied to that province which is used in the crafting recipe along with parchment and pigment), it then produces a map which can be studied, using up mental space and LP consumption on completion, of course it takes time too so stops an inheriting character just being able to get straight back to a fight.
Maybe too much but means that an explorer can tell their village mates about other thingwalls, perhaps add a duplicate map option which just requires a "Thingwall Leaf fragment" as well as a Thingwall map, each thingwall leaf could be shredded into X parts?