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Difficult, unless you decontent the diesel.
To keep prices down, you'd have to remove the variable geometry turbocharger (not necessary anyway, if you're maintaining constant engine speed) and go with a fast spooling low output unit. It'd still be more expensive than the gasoline unit, and weight would be a problem unless you give it an aluminum block... which would cost more still.
A perfect match would be a 1 liter 2 cylinder or a 1.5 liter 3 cylinder. You would need extra work to make them smooth enough... but maybe the vibration from the engine would be incentive for people to plug in their cars more regularly.
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