Bookhou at Home is doing some freehand piecing in rough, hand-dyed fabrics, that has a pojagi feel although she is not using double-side-finished pojagi seams. I'm wondering for such omni-directional scrap use, why not sew the pressed unit onto a straight-grain piece of thin cotton, and use the attachment seams to secure the raw edges. The piece would hang straight, at least.
Image of tear and repair (1) - cloth made with pure raw silk scraps, hand stitched on linen. to lay down or hang on a wall. size 96 x 60 cm. the back is left 'unfinished' and shows a Boro-style sachiko stitching.