I told you what i would do. I was in Alberta over the holidays. Never worried about our X3. I watched temperatures.

If you are carefully watching temperatures why not just cover a portion of the radiator, a home made winter front? Every truck in Alberta seems to have one. I did when I lived in GP and Edmonton.

It is a good thing you are now thinking about how to get the engine warm, solving the problem, and not just focusing on the condensate freezing, accepting that it will happen.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue