At 2nd level, an Order of Scribes wizard gets the Awakened Spellbook feature, which includes this benefit:
When you cast a wizard spell with a spell slot, you can temporarily replace its damage type with a type that appears in another spell in your spellbook.
So, can this feature do the following things?
Replace the type of damage dealt by a spell with a type another spell in your book at that level could deal. For example, a casting of Magic Missile could deal Poison damage if you have Chromatic Orb in your book. I think we can all agree this is a yes.
Replace the type of damage dealt by a spell with a type mentioned in another spell in your book at that level. For example, a casting of Fireball could deal Psychic damage if you also have Intellect Fortress in your book. (For bonus points: Does Feign Death's "resistance to all damage except Psychic damage" count? If so, can you change the type to Psychic or to any except Psychic?)
Replace another damage type based effect with a type mentioned in another spell in your book at that level. For example, a casting of Intellect Fortress could give resistance to Fire damage instead of resistance to Psychic damage if you also have Fireball in your book.
If you have any experience with allowing or disallowing option 2 or 3 in your game, please include your opinion on how that worked out.