You could try heating the hub around the threaded part but youll not want to get it too hot. If you have a propane torch or even an old blowlamp with a good spread of flame and keep it moving so that you dont get the heat too localised you should be ok. You need to get it just hot to the point where if you spit on it the spit rolls off in little balls as it boils (aint science wonderful?
). The theory is that the ali will expand more/faster than the steel and it should give you that little bit of help when it comes to removal.
Im not familiar with the inside of that hub but i wouldve thought that the bearing will be held in place by a lip inside so forcing it all the way through wouldnt be an option.
If all else fails then it may mean more drastic measures like drilling through the ring in several places so you can break it away from the hub, but that would have to be a last resort that shouldnt be needed with a bit of luck
Steve