I agree 100%, trainers don't teach you to power or depower,you do not have a safety to eject, you don't learn valuable lessons like depowering when the kite stall(which always seem like the wrong thing to do until you realise that it works every time).
Flying a kite is not complex, you pull on the left and it turns left,you pull right and turns right, anyone with half a brain will have it suss in 30mn.
Any modern kite is piss easy to fly across the window, the issue is that when it goes wrong and you accidently loop the kite, it gets ugly very very fast.
So although it may not seem obvious, the few hours spent flying a trainer without risking your life may still be worth a fair bit as you are training your brain to have the right reflexes.
The other option, probably more efficient is to fly a real kite on a huge beach with no obstacles nearby and get pounded a couple of times and eat a couple of kilos of sand.
That is definately my prefered option as it teaches you to respect the kite and all your mates will thank you for the entertainment.
PS:if your daughter can hold a camera, you might also make a fortune on youtube.

