In the fwiw category, I do like this. The only change from the base is that, after saying the necromancer uses their ability for good, the process of creating a minion is an unholy ritual?
To expand it, I agree that two paths are needed for this class. One that works with undead, and one that can heal. It seems like those two are exclusive. Then two spell lists for that as well. Or there needs to be a White Necromancer class and this one needs to firmly be on the unholy side of things. Just my two coppers.