Martha's suggestion still might work. Call your band office and ask if you have access to learning material which you can order. It wouldn't hurt to ask at the college there if you can study for the tests at home and travel to Soo to take tests when your schedule permits. In Mt. Pleasant at one time, CMU considered offering Ojibwe via distance learning. Once a year, I could afford time away from work to go to Michigan and would enjoy stopping off at CMU to take the exams for college credit.
Some persons teach a little out of their homes but have yet to offer their services on the net.
Maybe you could offer to introduce us to such good people who you might happen to meet.