I made a simple setup that reads the members of a bundle and copies the oppath as an instance attribute to points. When dealing with a huge amount of instances, it’s super easy to manage those instance masters. Click here to download the scene. InstanceByBundleMembers
Quick Edit: Please add the line oInstances.sort() to the Python SOP. With this line, the instaces will stay the same. Otherwhise it could be, that python reads the bundle members in another way from time to time.