I think it's fine, yes..
A generalized Major Virtue along the lines of "Works like Elementalist, but for any four Forms you choose" would only draw one concern from me, a tendency of some players to pick the four to maximally optimize their character without any care for thematic coherence (either character or setting). A writer or storyguide creating other coherent bundles of four Forms in advance and allowing players to choose them avoids that pitfall.
So, sure, the published "Nature Wizard" (Aquam/Auram/Herbam/Terram) looks fine to me, and so would the variant Lee suggested, or a new "Life Wizard" (Animal/Corpus/Herbam/Mentem).