I don't care for tied quilts either, as I don't think they will hold up as well as quilted ones. I have no idea what a GFG quilt is, but could you stid (stitch in the ditch) with a serpentine stitch on the seams and tie in the center of the blocks, if they are larger than 7"-8"? I have never made a quilt that large, but I have seen quilts that size done on regular domestic machines. Craftsy has some classes that can help you with this.