We have a '03 Pontiac Grand Am GT, 3.4L (3400).
If the resistor bypass doesn't solve it, another remedy could be a plug-in type engine block heater- I mean plug into household current. It keeps the engine coolant warm in the block. Every other car here in Montana uses one-works great for those below zero nights. When the wife pulls into work, just run an extension line and keep the car plugged in till time to go. Other than that, IDK, sounds like you've covered it pretty well as far as solutions.