My intent here is to create a wizard healer school that is viable and has a flavor that works. I know there are some who will object to the whole idea. I can’t really convince you if you are strictly against the idea altogether. I can only say that this proscription against wizards who heal is strictly a D&D thing. Plenty of games, and folklore traditions, show less of a separation on this point.
I did try to make the thematics of this work for me. The Vitomancer is a close cousin of the Necromancer but inverts that connection to give us the healing wizard.