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A real stretch, the waterpump works harder to push the coolant through another heat exchanger, increasing the surface area in which the coolant must flow over.
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On my cars the coolant always flows through the heater core. When on COLD it just pushes a flap so the fan doesnt blow through the core.
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Only time I ever heard of using oil to heat the car was a mining equipment guy in Grand Junction CO, who drove an old VW Thing. Great snow car, but a lousy heater. He rigged up an oil cooler and a fan in a sheet metal box and controlled it with a switch and a manual valve. Worked like a champ.
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Wonder if the Thing used exhaust to heat the car like the old Beetle did. Id prefer oil heat too, at least if it fails its probably not going to kill me.