Here is the fuel nozzle tool doubling as a sidestand support.
It hinges at the pin and you double it up under the sidestand or slide it open to refuel.
At the moment both parts are made of plastic with the card having about the same surface area as a crushed on end soda can, a common sidestand support.
A tether has been suggested and I'm trying to find a hollow pivot pin to allow that to happen, it's still a work in progress.
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Here are a couple of pictures with the tool used as a sidestand support.
I was even able to lift the rear wheel off the ground using the sidestand as a fulcrum. This is a 500 lbs bike
Either side can be used.