I may be missing something, so I'd appreciate a correction, but why all that effort when you can use collections.namedtuple and a custom object_hook for json.loads?

    import json
    from collections import namedtuple
    
    data = '{JSON string goes here}'
    fancy_data = json.loads(data, object_hook=lambda d: namedtuple('X', d.keys())(*d.values()))