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This sounds sensible, as long as the library is geared towards the local Māori community.

And, really. The underlying idea of the Dewey Decimal System is solid: have only a few top level categories, but subdivide and number them recursively. However you don't need to stick to the exact same categories as Dewey did. It's often good to deviate from them - because those categories depend a lot on the relevance and association between topics, and both things are situational and culturally dependent. Cue to the example - I see no connection between gardening and conflict resolution, but the Māori people clearly do, so if the library is for them it's sensible it groups both things together.