For dusting a bird, a shaker type of container can be pretty handy, too. It helps you aim the dust where you want it, but can be sitting beside you, while you use two hands to put the chicken into position. Wear a dust mask!
That bin full of dust sounds like it would work well. I've also heard of putting the chicken in a plastic bag with it's head sticking out and some dust in the bottom. Then you poof/jiggle/lightly whack the bag, to get the dust dispersed inside. This is the shake and bake method of dusting. I haven't tried it, but I always thought it sounded interesting. It would be dusty when you opened the bag, though.
I've gone to just encouraging more dust bathing and that has worked for us. We get a lot of rain here, so I started providing a dust bath in the covered portion of the run, that would always be dry. It has nice fluffy sand and some DE in it. It's much better than our wet clay soil on a rainy day. The only problem we've had is when we had a broody that wasn't dust bathing.