Angels are nothing but soul-fire. People are people. Soul fire makes you more of what you already are, be you Dog or Wizard.
So maybe a scion wouldn't be a template but a rationale for why a person has inhuman recovery. Or maybe if they were cursed to be a werewolf their animal form would be more like a spirit animal, driven to protect the innocent like a fuzzy, flea-bitten knight of the cross.
I mean, it's not really core, fantasy christian angel stuff but it feels more dresden, more noir. And if your character template had to include real wings they'd get in the way just like that John Travolta movie.