I have had manufactured a threaded steel disk that enables you to mount your iSight to a threaded tripod sled. You can affix the Apple plastic mount to the disk and the disk to the sled; or you can use the disk alone and attach the iSight magnetic base.

I have them for sale at eBay item 160404303393, with several photos of various configurations. Its brutally simple design affords many applications. And for those who care, I could have had them made in China for cheaper, but used a small Midwest machine shop instead.