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I guess you have never even considered a fuel-burning supplemental heater. But anyway, maybe insulating the engine compartment and getting a warmer air intake (eventually trying an adjustable one similar to what is used in small aircraft to prevent carburettor icing) would be the most cost-effective options for you.
OTOH if you decide to try a heating pad at the oil sump, the extra load on the alternator would be likely to help you reach the operating temperature quicker.
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