Stephen, given that you are only talking about a 1" wide strip of aluminum, I's suggest just shearing a strip, putting one end in a vice, putting some vice grips on the other, and while pulling STRAIGHT back on the other end, rotating it. You'll probably want to do about a 48" piece because the ends will probably be distorted from the vice and vice grips.
You'll have to go a bit past 180 to get it to stay because of spring back in the metal and the alloy you use.
I'm confident this will work BUT I'm not as confident that the bend will be uniform across the entire length. It would be worth a try.
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Kerry Pinkerton
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