At this moment you cannot control Trusted Publishers other than applying Content Updates. You can find the entries in the database tables dbo.Publishers. Maybe you can control it by adding your certificates to the PublisherName field? I know you can use it the other way around by removed entries.
Please note that I have not tested this method and probably is not recommended by Palo Alto Networks. So use/test at your own risk 🙂 And also inform me if it works or not!
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