As the title says, this would be a HUGE help for a perk that can benefit from a lot of different feats and is somewhat squishier than its weapon-wielding counterpart. Maybe trading out the +3 lore or the bonus vs traps.
I commend this suggestion. Giving Scion toughness would give it that tiny little nudge of extra power that puts it smoothly on-par with spellsword for viability as a mean claw-swinging melee sorcerer.
Toughness feat will not happen. In that case it will be a +2 con bonus instead, which is exactly the same.
While this has not been added to the background, I have modified the 2/+4 damage reduction to instead be a plain 2/- physical damage resistance. Coupled with ghostly visage it should give you plenty of survivability.