I'm on board with your thinking here .
I'm leaving some bitcoin on a ledger for my kids they're 7 and 4 now .
I talk to my 7 year old about Crypto as he's heard about BTC and Doge through Roblox! He understands the value of money and appreciates anything we do for him which is a blessing
Is good to teach our kids about the value of money and how to secure our money from intruders or scammers, but then I am kind of concerned about the age of your child.
7 years old child is not old enough to truly understand financial management and the true value of money, and he/she can easily be carried away there by exposing vital information.