Hi Pierre, I think that a conversion would be the way to go. Perhaps a Bafang drive where you could program the display/controller for less power for a child's safety. Also, you can get brake sensors so the motor cuts out when the brakes are engaged. You could use a smaller 3 lb. battery to reduce the weight of the bike. Luna Cycle makes/carries this with no hard case so you would need to protect it in a bag. Having the ability for throttle only is very helpful.Yeah, the more I think about this, the more I think building/converting a bike is going to be the solution. Thanks for the feedback
Edit: ebikemom, I just realized that you started a new thread for Pedal Assist ebikes for Children, so please move my reply if needed. Thanks!