I was rather thinking of some pack including things like a raspberry pi, a keyboard, a screen, connections and "real world" interfaces : sensors, motors... Which would make it possible to engineer basic and playful uses (like : water the plant when humidity is that low, switch on this light when I clap, or whatever safe thing the child is interested in). Learning while playing with tangible things. A friend of mine had his room full of tiny self-designed robots when he was a kid. He won children engineering contests and is now an engineer. He had a lot of fun doing this.