Pembroke played 6 man football in the Monroe County League for about 20 years in the 30's and 40's. I agree 6 or 8 man is a good idea. The only draw back is the travel. Don't worry about state playoffs. Come up with your own system. Look at all the schools struggling to put a team on the field. Auburn, Bland, Montcalm, Phelps KY, Jenkins KY, Bath County, River View, Castlewood, Craig, Twin Springs, Rye Cove, North Greene, TN, Unaka, TN, East Montgomery.
Another issue is that the field is not as wide or as long. Go watch an Oklahoma 8 man championship game on youtube.