if my system will work, we may process all fonts in texmf tree. but manual testing of the results will be needed I am afraid, and that would be really huge task.
Testing every glyph in every font is not required to have something useful. If your method creates a decent first attempt for them, we can post those files, people can use them and report bugs. Occasional, or even not-so-occasional, mistakes are inevitable and expected. As you noted, even in Eitan's files, after all. Thanks Michal. K