Garbagecrone
Nihil Novi Sub Sole
I think this would work, maybe toned down a bit from your version though. It fits with fallout quite well fallout 1 had vault dweller as the background, fallout 2 had tribal as the background and so on.
But wouldn't background be a thing more defined by the player, and not mechanically? Like, being a Vault Dweller and a Tribal had no effect on your stats in Fallout 1/2. Like, the effects of your background would be your starting SPECIAL, skills, and traits right? Backgrounds just feel like an unnecessary layer of mechanical abstraction.