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Inductive heating would be less efficient than a regular coolant heater. The reason being is you loose power in the transmission of power through the air.
I also wouldn't bother with 12V heaters unless you're maybe going to use a seat heater to heat yourself thus allowing the engine to warm up faster. The 12V power ultimately comes from gas, and your alternator is not an efficient device, so you pay for it vs just waiting for 'free' waste heat from the engine.
If you're real interested in heating up quicker, I'd recommend doing some modifications that don't require plugging in if you can't plug in like a grill block, etc. Also, search the site for 'fast warm up' or 'quick warm up' ideas. There are quite a few good ones out there.
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