You may be thinking about a setup similar to what was done in opal mining zones in Australia, where Beetle engines were repurposed to be used as stationary air compressors for pneumatic tools. 2 cylinders remained working as they were designed to, while 2 others were reconfigured to 2-stroke and used only to compress air. Actually, if I were you I'd rather get a 4-cylinder engine for the Jeep and bolt an air compressor into that.
BTW if you're considering to use pneumatic power to move the vehicle, you should search for that prototypes released recently by Peugeot and Citroën with a pneumatic auxiliary drive as an alternative to the electric auxiliary drive which got mainstream in production hybrids.
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