You bringing it up this way makes me think of the story of another game.... during the Eldritch Moon story in Magic the Gathering, the remaining Cathars invoke benevolent spirits to help protect them against the eldritch horrors that were infesting their world. So I could see a more benevolent type of necromancer being a type of pet job that summons the spirts of the departed to help them fight. Though at that point, the job would be fairly fair removed from a classic necromancer and might not even be considered the same job by the players.
And unless they think it's too spoilery, they could have characters like Hauchrafant, Ysale, and Papalymo being warriors of light we could invoke to perform greater feats