This is a good idea!
May I bake it as follows:
Instead of using the "English" version delivered by the developers of non-standard plugins, let Moodle have its own "English" or we may call it "Original" language, that is used as the English language package embedded in Moodle, so this package will not be collected directly from the repositories of others for every new release, and let this "intermediate English version" be maintained by Moodle HQ, corrected and revised by the community of translators...
In that way, Moodle does not need permissions to write back in others' repositories and get a chance for Moodle HQ to have a saying about the quality of the "English" version created by developers outside Moodle.
As you said, Stamos, "Just trying to give ideas..."