It’s a pity we never achieved the dream of an extension census. But also little surprise: I can’t think of any decent ways to meaningfully effect it either. Maybe just a direct appeal to the authors of the I7 games in the major competitions for the past 3 years. (Something could be attempted with running ‘version’ on them all, but so many extension authors are so often modest.)
But rereading those threads and looking for correspondence with the unupdated extensions is a great idea (if not one I’m volunteering for. 
)