I would embroider the blocks separately and join them QAYG method ( or as a whole top, layered and quilted. I would use a washaway stabilizer for the embroidered designs. I would not use a fusible because it might affect the softness of the quilt later. You can complete your quilt without removing the washaway stabilizer as it will "wash away" n the laundry. Good luck and be sure to show us the finished quilt.