Before you even plan to go on that route on teaching kids cryptocurrencies I think a much better approach for this is for you to start lessons about financial planning and investing because diving in to the topic about cryptocurrencies would only leave them with more questions than answers. Just think of it this way, if people the same age as ours are having trouble understanding what cryptocurrencies are what more could the clueless kids understand from your lesson? Just my two cents with your current plan.