You are to be commended for taking the trouble to ask a physician about teaching children Aikido.
Well, thanks. As I said in my post, the doctor is a MEMBER of my dojo - she and her daughter are both my students. We had a long talk when they started training. She agreed with me about joint locks and kids - that in her professional opinion they were a BAD idea.
And anyway, you have seemingly forgotten many of the other points people have made - mainly that wrist locks are hard to do under stress without a lot of practice and that any kids you teach are liable to get the crap kicked out of them if that's all they know.
I will echo the 'wow, just wow' sentiment.