You can easily avoid all the dirt, gravel, sand, etc. from Santiago all the way to Ushuaia with the exception of the stretch to San Sebastian. Get a map and puzzle it out--you'd head directly over the pass to Argtentina, then work your way across to ruta 3. However, these routes are far more dull, subject to the same sorts of ridiculous winds, and riding all that pavimento disqualifies you from bragging about how difficult it was when you meet other riders. What's the use of that?
There are a slew of giant GS machines on ruta 40 and its brethren. There are swarms of bicycles, too. It's not as hard as it's often made out to be.
My very vague, highly suspect memory is that the Carratera Austral is about a quarter paved, the rest mostly pretty good dirt. Only a few sections of the dreaded ripio bermed deep around ruts.
Hope that helps.
Mark
(from the small country immediately to the north of the Great Southern Continent)
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