I'd create a few interesting combat encounters, then, rather than looking at any big scenario or module.
Perhaps throw in a few Hauntings surrounding an old cave / home with a leather flaps on the entrance made from roper skin that used to be the home of a family of Mongrelfolk exiles who just didn't belong. One by one they starved together and left a series of minor hauntings that aren't dangerous but can be resolved by doing small things like laying the child skeleton that is wrapped in rags in it's mother's arms. Things like that if you want something roleplay intensive.
A Giant Worker Ant has gotten separated from the rest and is scouting ahead for food. Best slay it before it lays the trail for more and than bury it's entrance so that the others don't smell it's death and come looking. (Knowledge Nature can reveal the risks and Knowledge Planes could even link its confusion in coming this far away from the rest being an indication of the Worldwound's presence).
A talkative ghoul (looks like an undead Mongrelfolk but with ghoul stats) could try to barter with them, selling odds and ends for valuable items, then getting angry that the deal isn't good enough (or the PCs aren't buying) and attacking.
Alternatively there could be a few defences for Neathholm that have been set off by all of the troubles and must be bypassed. A pair of Giant Flies could have been released from their cages into one of the passageways with a dodgy portcullis keeping it from heading into Neathholm itself. Basically when the wire got tripped, the portcullis falls and opens the cage for the Giant Flies and the wire got tripped awhile ago.
Would these work? And how much XP do they need?
