For anyone who is interested, the below code solves the previously unsolved problem. Current versions of OpenComputers add the .store method on ME controllers, allowing the storing of item information in a database for use with the export bus. In-world configuration has an adapter touching an export bus and an ME controller, and has a database upgrade in the adapter.
This code solves the problem of exporting one of each item, which I found of particular interest due to Thaumcraft's fancy new scan-everything-in-a-chest feature...
https://pastebin.com/wQJNJkej
