The plugin can be found here.
It’s open source now, since I built it and @csmu has been ignoring me (and my requests for payment) for 14 days now. I am not sure whether to attribute this to malice or to stupidity but fact is that he has been online and is not responding to PMs here and on his own forum and is not responding to emails either.
Note - License is MIT but with the restriction that it cannot be used on any forum csmu is admin on. I will remove that restriction if I receive payment for my work.
Anyway, plug in your GCP api key and configure the categories you want this plugin to look at. It will then OCR the first post of every new topic and make a second post with the results.