I'll reiterate what's been said, a pad is not only for comfort, it's for insulation. Look at getting a long Z-rest pad and cutting it in half for just your torso, and you and your friend can share the low cost, about $25 and a half pound each. The extra insulation will make your nights much warmer. It's amazing how much heat can be conducted out of your body into the earth.

Then seriously reconsider your aversion to quilts. The enLightened Equipment quilt I bought for my last long bike tour was the best piece of outdoor gear I've ever invested in. I resisted a quilt for decades--bad move.