I'm not saying you cant bend it, I'm saying without doing it properly(raw-to-aged), it will fail at the bend at some point. The initial bend will create a "craze" mark/s on/just below the surface. The craze mark will grow with each load cycle, with the craze growing into cresent moon shaped "beach marks", that slowly penetrate into the shaft until it breaks. The break will be spiral/semi spiral, or beach mark through the shaft 90 to the axis, this is text book. Aerospace gear and control boxes utilize allot of 7000 series aluminum because of its strength. While bicycle frames for example tend to be 6000 series or other aluminum alloys because they handle load cycling better than 7000 series aluminum. I have built quite a few of both. The stakes could have some potential, but like was mentioned earlier, go with a nail type head, or go with a reduced diameter, just below the drive end, with a cord attachment.