[Bro] customize msg in a Notice hook

[Matt Stucky]

How would one go about customizing the message for a notice when it matches
specific criteria?

Here's what I've tried:

hook Notice::policy(n: Notice::Info)
        {
        if ( n$note == <Notice> && <additional criteria> )
              add n$actions[Notice::ACTION_EMAIL];
              n$msg=<custom message>;
        }

However, that changes the message for every notice in the notice log...  is
there a way to scope that so it changes the message only for that one
notice instance?

Thanks,
Matt
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