I think Rockwood and Hungry Jack are the closest big outfitters? But if you want to spend the night in a really nice room and get a wonderful breakfast, stay at Poplar Creek Guesthouse. You won't even have to drive back to pavement to get to your EP. And Ted and Barbara have lived on the Gunflint for about 6 decades now, so they are excellent resources and great people. If you need some gear or a canoe, the outfitting side of their business is called Boundary Country Trekking.
Poplar Creek Guesthouse Boundary country Trekking