Whatever works for you John. Sounds like a good idea.
As far as the steel ball system goes, what makes you think it is a commercial system (rather than someone just describing a home-brewed technique)? Why not try it yourself and see how it works? But using balls you end up with lots of hollow space. A low-temp alloy poured in the same area would probably work better.
To be honest, I don't like the sound of that "system". First of all, if there is even a small hole in the item being filled, thin CA can flow out making a mess. Then the steel balls can rust over time, even just from humid air. The rust might make the glue to separate from the balls, causing them to become dislodged. Lead shot would probably be a better choice of metal. Or just use lead putty with no glue.