If your talking about a perm. cage for the crickets then thats probably not a really good idea. You'd have to take out anything in with the crix before you let your beardie go in. I keep their food, gel water stuff, and egg crate in with my crickets, I know my girl would eat all of the crickets, then she would go for the gel water, then she would start eating the egg crate.
I know people have made feeding containers that are always in the beardies viv, they can go in there, eat their crix and get out, but I've forgotten how they did it.