Approval Policy based on change in one property

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I'm trying to create an approval policy that focuses on an update to one property.  I have a default approval that should ignore any change to this property, then a secondary approval that should only focus on updates to this property.

Higher level, here is my goal: Create a flag that defines whether a subscription can be run.  That flag will be edited by an admin after the node is approved so I don't want the node to go through the default approval again.  I don't want requestors to see this flag at all so I've put it in a view they wouldn't know to use.  Currently our default approval is kicked off based on a response to a separate "flag" input as there are situations where approval is not necessary on a node.