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Motor ideas, since this is not far off of something I'm messing around with...
Starter-generator from a (mild) hybrid would be compact and comes with an automotive pulley on it already.
Treadmill motors happen to have 17mm shafts on them, which matches most larger alternator pulleys I've come across. Smaller diameter than the starter-generators, but easily twice as long.
Of course, if you're going to run the A/C on it, you could just take it farther and make the engine a mild-hybrid. Nowhere near as straight-forward, mind you.
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