In 3e, I might treat powerful True blooded creatures as quasi-deities,
Divine Rank 0, as detailed in Deities and Demigods. Many of the blood
abilities are similar to weak Salient divine abilities, and those could
work as true bloodline abilities.
The Gorgon was treated like this in the playtest draft; this is how I'd handle other true scions as well. Regarding the salient divine abilities, I also agree.