I’ve never tried to post photos, but I’ll give it a shot. I, too, was concerned that the (chrome on my black ’14) gas-cap cover would be scratched when riding. I have an additional three keys I need to carry on that ring. I went to the hardware store and got a 1 and 1/8th” long piece of black silicone rubber tubing (they just gave it to me) that had a ½” inside diameter, just enough to snuggly fit the three non-ignition keys. Adjust your inside diameter of hose requirements to fit the number of extra keys you need to have on that ring. (Silicone rubber won’t sun-rot as badly as plain rubber tubing, which is also unnecessarily thick when carrying around in your jeans pocket.) I cut a V-notch on both sides of one end of the tube to help hold it onto the keys with a 1 and ½” silicone rubber O-ring. (Be sure that it is also attached through your metal key-ring. Otherwise you will lose it rather immediately. The O-ring also acts as a sort of rubber bumper when riding and keeps all metal key components from hitting any chrome.
If the photos don’t post, insert complaints here. Electronics hate me. That’s why I tried to be so specific in the description above; I anticipate a problem with the photos and I don’t have the patience to try twice. (Okay, three times. I’ll admit it.) The third photo, assuming you can see it, has a small piece of paper under the O-ring to help highlight things for photo purposes only as everything is black. The small metal barrel on the metal ring is just the female connector that allows me to attach it to my car key-ring should I so desire.
Hope this helps you. It's the cheapest solution out there and doesn't look bad. Happy trails!