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I personally wouldn't idle to warm up.
Get a temperature gauge so you know what coolant temperatures are doing, and set an alarm for some upper limit, like 215 F. Then grill block in a way that you can quickly add/remove it. I use foam pipe insulation wedged in the grill slats.
Can you put a higher wattage block heater in? An oil heater would help too.
You could add insulation to the engine, like a blanket or something, to retain more heat.
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