No I don't know how portable this would be. But if you do most of your Gear VR time at home this could be a solution. I saw this while watching a video review of a Gear VR game. I am very, very tempted in picking this up...
Amazon.com: Pyramid USB Multi-Angle Phone Cooler Titan TTC-NF02TZ(BB) Black: Cell Phones & Accessories
Amazon.com: Pyramid USB Multi-Angle Phone Cooler Titan TTC-NF02TZ(BB) Black: Cell Phones & Accessories