I have two websites using a multlingual plugin called WPML. It has a framework for integrating its multilingual features with other plugins, provided the other plugin uses a "compability package". Please take a look here.
It's not only about translating the High Performace SEO admin pages - it is about having it integrate with the multilingual post management features WPML offers.
It would be wonderfull to see your plugin go multilingual, do you think there are any chances?