When I was first married, eons ago, I was used to having more blankets on my bed, compared to my new husband and his two. I couldn't sleep with so few, and he couldn't sleep with my four. My solution was to stitch, with big stitches, down the middle (by hand with big stitches) through three blankets. Then I treated them as if they were a big book, and folded more of the 'pages' towards my side.
Could you make two thin quilts, button them together down the centre (right sides facing), so that one could fold back onto the other side?
Ooops, sorry, double post - it was taking so long to go, I hit send again.