I wish I had this idea when my girls were young. It's clear we didn't do a good job with teaching them how to handle money properly. The other day, my youngest asked "What is a mortgage? What does it mean to have a mortgage? When the commercial talks about refinancing, what does that mean?"
Oh, boy. What a confusing concept.
Additionally, they've been giving too much money away. I'm glad they're generous, especially since so many people are in need right now, but then they hit me up for more cash (nobody is currently working due to COVID19).
Maybe there's a way to make your idea work for my older children.