set i18n variables with drush?

I want to i18n variables with drush, e.g. after adding the following to settings.php

$conf['i18n_variables'] = array(
    'site_name',
    'site_slogan',
);

To do...
$ drush vset site_name --i18n fr "Le nom du site dans une autre langue" #Or something.

Maybe it's already possible, maybe it's okay to set it through a short php-eval statement?
Either way it's more convenient than setting it through admin/settings/site-information for a language one is totally not familiar with.