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On my car, it idles at ~1k rpm when coasting.
I think you'll put more wear on the starter and ignition trying to turn on/off your vehicle while coasting.
On my 2003 Hyundai optima, there was no rev matching, but the car would jolt when shifted back into gear, with no rev matching..
Dangerous!
Ac does very little to warm up the engine, and I only use it when decelerating or stopping. Then also shift one or two gears down, to convert kinetic energy to AC. I turn off ac at acceleration, and turn it back on when coasting or decelerating. Saves me between 1 and 2mpg..
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