My apologies, I missed your post somehow! And didn't mean to slight you. I'm with you. Go for it and if the rod is too much to handle, get a shorter, lighter one.
I'm interested in learing the best ways to teach kids too, and just did a Google search on it. There is quite a bit out there on the subject, one forum post in particular that's worth reading.
How to teach kids to fly fish - Fly Fishing
This link is a great story.
Fly Fish Chick Blog Archive A Sweet Take on The Blackfoot
Al Crise, who just recently died, wrote a book about teaching kids too, which I hadn't know about and which I will order myself. I'm sure it's a good one.
Someone the search turned up recommended a rod lenght twice the height of the kid. There was no reason mentioned for it though.
My daughter finally showed an interest in it at age 11 when we went to Colorado to visit friends - who lived on a ranch in the middle of nowhere with a brown and rainbow filled brook running through their backyard.
It was a very scary experience for me because all I'd brought for a rod was a 7' 4wt bamboo rod that was irreplaceable.