I don't know if you are limiting yourself to GW models or not but the Mantic line of ogres may fit your purposes. They only have 3 poses I believe but they are all sort of awkwardly shuffling stance. They don't have robes or aprons exactly, a combination of straps and spiked leather/metal sheets over their bodies. I tend to use large capes around the waist of models to flesh out robes, I don't know if they'd work on these guys though because of the size.
Here is a size comparison - the mantic one is in the center while the GW model is on the left.http://kiwihammer.co.nz/wp-content/uploads/2013/07/002.jpg
As you can see they are much more streamline ogre kingdom type ogres. Their posture also makes them look kind of unsure, which I like considering their leadership.
You can pick them up on ebay for $1-2 a piece if you are patient.
Edit: forgot to mention that talos masks fit pretty well over the neck stub where their stock heads are supposed to go.