Ok, I've got an idea, don't know if it'll work though. How about blasting a hair drier or heat gun if you have one in the air intake so the air going into the engine is warmer to begin with. I've heard of people using a blow torch or similar in the intake of old tractors to get them started in really cold weather so I'm theorizing that a hair drier would have the same effect. The 5.9 Cummins in Dodge pickups also uses a grid-heater that heats the air in the intake instead of using glow plugs.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k