I'd like to use the adapter's bluetooth to interface with the Mini from the Harmony. And yes, this is because it would be out of sight. I would assume this would require some software on the Mini if the two can't talk from BT pairing alone. My main question is will the the adapter pair with the Mini? If they can see each other, I can write something to handle things from there.
I would also like to stick with the Harmony (or something similar) to have a dedicated remote for both AV and the Mini rather than relying on an iPhone to control anything.