If you have a chin controller array or similar large bit of tubular metal set up around your face, you might think to attach useful stuff to it. I know we do. There are loads of useful grips and holders made for bikes, but a bike frame is (usually) a lot thicker so the kit doesn’t grip properly. But bike gear comes to the rescue again: you can buy cheap grip tape (this is the brand we bought) and wrap it around the array, bulking out the tube up to a more standard handlebar size. We used this for the coffee cup holder.