When very rural sometimes we find it best just to do it ourselves. In this case 4,000 plus file strokes will sharpen my 6 tpi band saw blade. It did very well for 4 years cutting fire wood for the shop stove and then the weld broke. Oh well, I bought the saw and 5 blades at auction about 10 years ago for 50 bucks and it's served me well.
Maybe some young whipper snappers will question why a magnifier. Here is hoping you live long enough to need one.