Fubar I do as You suggested and I let the rig warm a little more than the other rig i drive.
Yet have also just jumped in it and took off being in a hurry not having time to wait. I would idle though if possible.
Fubar I ran last winter down to 10 degrees an many days. We always have a 2 week period in the winter or sometimes 2 or more where it will stay below freezing for weeks but, the nice thing is once it is over We shoot back to 40 which is where it seems to stay allot in the winter here.
If it ended up causing a problem which I do not think it would the t-stat is so easy to change You could do it yourself in 30 minutes to go to a hotter one in winter if You felt it needed it. But, seriously You could really cover part of Your radiator as i would think someone makes a nice looking canvas cover that you can ajust the amount of the radiator that gets air cooling. In fact an upholstery could probably make one with H2 on the front.
I really do not think You would have a problem.
If You did switch it out and take it to the dealer and ask what is going on. 
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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