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The stand problem:
The Quasar roofed motorbike uses a double side stand (one each side) operated by a single pull rod. Simple and it works. Only drawback I see is that it leans the bike over to whichever side it's initially tilted when the handle is pulled. I think the Royce Creasey Voyager uses a long lever to operate the centre stand from a seated position. Ross Cowie in Canada did work on landing gear. Peraves Monotracer/Ecomobile has probably the most famous commercial solution.
I have designed and built many pneumatically operated machines. Pneumatics can definitely do what you want, but you need to calculate the volume and pressure to size the reservoir (and on-board compressor if needed). Compressed air powered motion is very energy inefficient, so you need to be careful how you use it.
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