The typical end-user of your CPAN distribution wants a handy command they can run to report IP address changes, and doesn't really care how it's implemented. Is that right?

If so, the principle of least astonishment suggests your distro should install a well-named command, with a clear usage screen, in the conventional CPAN way.

A widely used example of such a (non-modulino) distribution that springs to mind is Perl-Tidy, which installs a perltidy command in the conventional way for each platform. I've happily used this command for years without caring how it's implemented. Looking at it now, I see it's essentially a one-liner:

exit Perl::Tidy::perltidy( argv => $arg_string );
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