This chapter presents an evaluation from a natural language processing (NLP) perspective on the concept of wikigrammars, using the Breton ARBRES wikigrammar as a case study. It explores the utilisation of a wiki-based platform for documenting the syntactic diversity of a low-resource Celtic language, with an interactive component aimed at community engagement. It constitutes a comprehensive, annotated corpus that supports both theoretical linguistics and NLP. We advocate for the adoption of such platforms by communities speaking minoritized languages, arguing that they provide corpora with rich syntactic, orthographic, and stylistic diversity. The artificially selected diversity of wikigrammars may mitigate the scarcity of extensive, freely available corpora in low-resource language contexts.