Hm, didn’t think who the PM would be “to” was the question.. and given the following workflow, that answer could be edited before sending:
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User posts to a discourse, and due to its settings, the message is held for approval.
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Admin/moderator reviews the list of messages pending review, decides not to allow this post
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Admin/mod chooses “convert to PM”
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the message is converted into a PM from that admin to the user who posted it
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the subject is
re:the [the initial subject line] -
the body is the posted message, wrapped in a markdown quotes bracket >
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the admin/mod has the opportunity to edit the To, Subject, and Body as needed.
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If the admin/mod hits send, it becomes a PM for real, and the post is removed from the queue.
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If the admin/mod his cancel, the post goes back to the queue.