Maybe give the changeling a Charm that lets them take non-changelings to the Hedge, if you need to keep the party together (and that's not something they can already do--don't know much about Changeling.)
As I remember Changelings can take anybody into the Hedge, its just the nature of the Hedge to drive insane and warp those not attuned to it.
All Comicshorse's posts come with the advisor : This is just my opinion any difficulties arising from implementing my ideas are your own problem