A grill block might be a good thing -- keep the snow out of your radiator. As long as there's something behind it (the grill) there, little reason it would buckle under pressure.
Most people seem to use lawn edger for their air dam/skirt...it would just give way if it scraped on anything, like hard/deep snow, and then return to it's normal shape after. I suppose the cold might make it brittle enough to potentially break, but better that than tearing your front bumper off.
As to anything else...if you design/build it to take a beating. it will. If you make it out of papier-mâché, it's going to crumble at the first sneeze.
If you can get one, and the shape works, you can try bolting a trimmed-down bumper - from the same make and model - upside-down to your current bumper, to make a chin spoiler. It'll be just as tough, since it's the same material. All depends on the shape/design of the one on there.
Have fun!
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