you are so right about karen being the best of both worlds between babs and kory. All of there strengths without the weaknesses, Karen unlike kory can fit into dick's more normal life outside the costume. They can go out together in public like hot you adults and not blow dick's Id. Unlike babs Karen dosen't limit dick to just batman and Gotham, Karen can allow dick more freedom to be/play in the greater dcu. Some worlds finest adventures in space? Or time travel? Some multiversal hopping or just date nights of ass kicking around the globe.
Also I just thought of this, dude there kid would be a BEAST! That kid would have all the powers of a super with all the skills of a bat (and the looks of both parents) that kid would basically be DC's GOKU!