"So far, that’s a good plan, but putting an unsecured piece of metal inside your brake drums is a Very Bad Idea."
However, they are certainly not unsecured... I wrapped the steel strip so that the ends fall on the flat spot of the cam. That spot is under constant pressure from the brake pad and I've had no problems with this setup for over 1000 miles on my Hobbit alone. No sign of wear or loosening of the strips at all.
Colin, not sure about the gauge... I'm thinking 16 or 18. what ever I had lying around at the time.
In short, it works great and as a plus is super cheap.