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Take levels in cleric, witch, druid, or bard.
There's really no reason wizards can't cast healing spells, other than that's supposed to be a cleric-only thing (which is also shared by druids, witches, bards...). The only reason I can see not to do it is because wizards already do everything else, but that horse is long out of the barn.
If you want to talk about house rules, then you'd have to explain why you want to cast these spells as a wizard, to come up with a reasonable way of making it work.