Strangely enough a have a DP-E in parts out of a boat right now. Don't have to do the bearing you are referring to though, so these are just thoughts rather than comments based on experience.
According to the parts diagram, as you look into the rear of the flywheel housing there are - a Sealing Ring, a Bush, 2 Retaining Rings, and then the bearing. From the drawing it looks to me as if they may be designed to be installed from the engine side of the flywheel housing, which means pulling the housing off. The only thing that suggests that they may come out through the rear of the housing is the location of the retaining rings. If you can pull the Sealing Ring and Bush, you should be able to access the Retaining Rings and remove them. If they come out, the bearing should be able to be removed by pulling the shaft. Sorry I can't help more as I am not at work where the drive and engine are sitting for me to inspect.