I have never seen the need for using dryer sheets at all, not even to dry clothes. Started out from the days when I was too poor to afford much of anything much less dryer sheets! Now I don't see the need for them at all - just adding chemicals to my clothes and more garbage for the landfill.
Try using gift wrap for a foundation. When I needed 15" squares this worked great. Paper tears off easily. Next year after Christmas buy a cheap roll or two and keep for quilting!