I could be wrong, but are you overthinking this a bit? This SWQL query does what I think you want, can be customized quite easily...
SELECT I.Node.Caption AS Device, I.Node.IPAddress, I.Caption AS Interface, I.MAC
FROM Orion.NPM.Interfaces I
WHERE I.Caption LIKE '%trunk%'
You can add it to a page in NPM by customizing the page, adding a resource of type "Custom Query" and then pasting this query into the box. Otherwise, try loading the SDK onto your box and running it from there. I choose to use the interface caption because it has both the interface name and description, you could use IfName and Alias instead if you want them broken out.
Could be the wrong info, but I think its what you want...