Business rules for notes left on a timeline

If a note is left on a timeline rather than within a conversation it would be great to understand how to identify the differences between a conversation with a customer and a “conversation” that is considered a note. Kustomer support let me know that this is not possible, but has anyone found a workaround? 

For context, we would like to set up a business rule to update the conversation contact reason (custom klass). We are open to setting up a workflow instead if a business rule isn’t possible! 

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