it's impossible to do it safely. open source model for kids!? without moderation every 'hacker' would like to get access. imho, the only option is to sell support as a business to someone else. with payed subscription it could survive for some time. but obviously not for long without new robots ans subscriptions. more interesting would be to have this sort of chatgpt for kids. with some basic robot control like flashing lights. then it would be possible to have several small and big manufacturers making mechanical robots and contributing to common software development.
another proof for 'robotics is hard'...