My first teacher once did a few kihon-gi classes in the early mornings. He was pretty strict about how we went about it, there was no talking allowed at all, and it was all very basic (ikkyo-yonkyo). I only made the first class, but I learned loads. The thing about that kind of class is a lot of stuff can suddenly fall into place when you're taking it nice and easy, or at least that's how I found it.
How well this would've worked if we'd done it all the time, I don't know.