If it was me I'd make a tee out of 2x2 square metal tubing and plug it into front receiver hitch and then mount the kolpin clamps on it to carry the auger. Attached is a picture of the kolpin clamps, they are pretty stout. If you don't have a front reciever you could make something to bolt onto the bumper. I think I have the same bumper as the XMR so if you decide to add the front receiver hitch you'll likely have to go to harbor freight and get a hitch extension and then cut and redrill it to extend the factory reciever to be flush with the front of your bumper, at least I did on mine. But then you can add anything you want to the front fairly easy and remove it when you don't need it.
that sounds like a great idea. I never thought to add the front receiver. Then the possibilities are pretty much endless for custom attachments and really easy to swap in and out.