My thoughts were towards teaching your own kid actually. Quite much from the beginning. But thanks for the info about the kid's classes - we do it quite the same way.
Ikkyo to the wrist???
Anyhow... the little ones have so much trouble getting the hang of the basics that they won't get to sankyo and yonkyo before age of 10
The ukemis, moving and ikkyo, kotegaeshi, iriminage, sumi-otoshi and the other basics is quite enough.