I agree.
There are other kind of dwarves adventurers in WH, but IIRC, most of them are not exiled indeed.Durkon: Slayer. The only known dwarves to be exiled were slayers. He might have been a priest prior to being exiled (but not a magical one). Or maybe a physician.
OOTS probably wouldn't have bothered resurrecting him (which isn't even an option in WH), figuring he probably would not be happy at all with that.
Which would certainly be a good motivation for him. The dynamics between orcs and goblins in WH can be paralleled with the dynamics between bugbears, hobgoblins and goblins in D&D.Red Cloak: Not sure. But I think a skaven seer. Goblins can be cunning in WH, but are ultimately just the whipping boys of orcs.
Wanting progress for his own kind is something a goblins would want.
I don't see this in a skaven who hates everyone outside of his own Clan (and inside to a degree), and who already believe that skavens are the superior race and just need to keep conquering other races' territories.