I've used halftanked method for years (usually I drive the point of a sharp awl into the metal part of the seal, between the shaft and outer seal edge to get the screw to start).

They (bluepoint KD ?) that I picked up a while back. Bacically a hollow shaft tapered and threaded on the outside. It screws into the seal then has a pushout bolt that you screw in and it pulls the seal. Actually pretty slick, seems like it was about $30.

Yeah yeah I know $30 for something I've used $2.00 worth of tools to do the same job for years.....but hey, it's a TOOOOL and I didn't have one