I say go for it, the worse that happens is you find it doesn't work and you have to cut the buckles off.
I would suggest that you be sure to put enough straps in so that you can control the entire pad or you may find that it buckles (An instance of bending, warping, or crumpling; a bend or bulge.
) out in places, causing cold spots. Perhaps 3 across (head, foot, hips) and 2 diagonally forming an X
the length of the pad would suffice. Or you could need 5 across instead.