I would really go for a custom eclipsed orphan with Noble Scion and Gun Archivist parents, but that's not a choice.
The custom eclipsed orphan sound quite interesting actually. The Eclipsed Orphan advantage of having adventuring parents, and now one of them is even noble.
We only get one passive from them, so possibly no etiquette or upper-class residence from noble scion, but probably still some social influence. Possibly not Astral Mage passive, but still maybe access to magic via core nodes. I can see us socialising by day, enchanting bullets by evening, hunting targets by night.
Is there anything from the core nodes of a full astral mage that we might want that this doesn't give? I can't say for sure. Such a significant part of why I wanted Astral Mage is already in the passive.
[x] [1] Felixar,
Eclipsed Orphan (Custom), Gun Archivist
[x] [6] Felixar,
Eclipsed Orphan, Gun Archivist
[x] [3] Felixar, Noble Scion, Gun Archivist
[x] [8] Felixar, Tranquil Village, Gun Archivist
[x] [4] Felixar,
Eclipsed Orphan, Astral Mage
[x] [2] Felixar, Noble Scion, Astral Mage
[x] [5] Felixar, Tranquil Village, Astral Mage
[x] [7] Hicys, Tranquil Village, Gun Archivist
Edit: Looked back through the racial passives and found that Ambush Predator isn't actually innate. Though it's no longer an option, we could absolutely have chosen say, Bhomon and Eclipsed Orphan, then used luck on Eclipsed Orphan until we got a Felixar parent and taken Ambush from them.