Just a thought:
You might consider crossing the border at O'Higgins. The border there is not a road, but instead a river that you must cross during the dry season (now) into Argentina. Very few people do this crossing. I don't think there are official Aduanas there, only military folks - but they do allow crossings - which means that they will not be very familiar with all your issues, and will most likely be much more concerned with your safety of crossing the river.
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