Unfortunately, neither representation object have a collection or enumerator that can be easily used to get all component occurrences that are being effected by them. The design view representation has the DesignViewInfo property, but it contains a long complex string full of XML tags, which isn't fun to navigate. What may be easier, but perhaps time consuming, would be to activate that DVR or LOD (by code), then loop through all components checking their Visible or Suppressed status, and when true/false adding them to a collection of sorts.
Here are a couple of links on the subject.
LevelOfDetailRepresentation Object
DesignViewRepresentation.DesignViewInfo Property
Design View Data XML Formatting
One other option I haven't looked into would be to check Attributes, but I don't know if that would take longer or not.
Wesley Crihfield

(Not an Autodesk Employee)