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Argparse's wrapping behavior is determined by the formatter_class:
http://docs.python.org/library/argparse.html#formatter-class
Is it reasonable to assume that if you're wrapping your own messages you're already specifying formatter_class=argparse.RawTextHelpFormatter? If so, then perhaps the message should be printed via something like:
 formatter = parser._get_formatter()
 formatter.add_text(self.message)
 file.write(formatter.format_help())
This is what we do in _VersionAction, so I guess it's probably what we should do here.