Currently contenthandlers for contentmodels registered by JsonConfig are not added to the global registration of wgContentHandlers, because they make use of JsonConfigModels and ContentHandlerForModelID.
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Noting that I've been able to save .map pages using the api, e.g. https://commons.wikimedia.org/w/index.php?title=Data:Sandbox/Evad37/Highway_192_in_Iowa_(3).map&action=history, just be specifying a Data:_____.map page name, valid JSON (including the licence, source, description fields), and not setting the content model. The pages seem to just get created with the correct content model.