I had a thought. A concrete anchor exands as the nut is tightened. If you get one long enough, and were careful, will it work to grap the bottom of the bearing and pull it upward?
Here is another: You can remove a flywheel pilot bearing on a car by packing the void behind the bearing with grease, inserting the right size bolt into the bearing and smacking the bolt gently with a hammmer. As the bolt goes in, the grease pushes the bearing out. Will this same principle work to remove this bottom bearing? As the bearing come out, you will need to continue to add grease to keep the bearing moving upward.
What do you think? Worth a try?
Rick