You would need a really bulky yarn for that gauge. Bernat's Softee Chunky might be a good substitute. It could be a little thinner, but you can use more stitches to get it the same width. You can even use a worsted weight and size 10s, you just need to add more stitches to the cast on. So use whatever yarn you'd like, adjust the needle size to what's good for the yarn, then use more stitches.
sue- knitting heretic