I have seen similar requirements come up recently and would like to learn more about this to see if we can add something to EndNote in the future to help automate this.
Does this formatting style have a name? Are there formal guidelines published anywhere?
In the meantime, I am fairly sure the EndNote API could be used to write a plug-in that parses through the Author and Year fields, copies out the required data and pastes it into to Label field.
If anyone is interested in trying this, let me know and I will try to have someone be available to answer some more technical questions.
Jason Rollins, the EndNote team