Using attic heat for your dryer has already been done by at last one person:
Converting a Clothes Dryer to Use Solar Heated Attic Air For Drying
IMO dust isn't even an issue. I have had my attic fans going for a few years now and I have cellulose insulation. My outlet vent in the kitchen has virtually no dust build up on it. The fans in the attic are just as clean as my fans I use year round in the house.
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