CHECK THIS OUT!!! Coach Arsen from @gymnastics_olympica_usa shared this with us and we love it!
Athlete uses the side blocks to find their vertical handstand by doing a small straddle. This allows the body to find true vertical versus kicking off from a wall forward or backward. Athlete checks the handstand balance by bringing the feet together and back to support on the blocks.

Then they can use the close of the straddle to help initiate a pirouette and the true test is if they can finish their pirouette and straddle for support and still remain in a handstand.
This is an easy setup and a simple enough drill for kids to do. But to do it well takes great control and practice.

Hope this helps you and your athletes create their Best Darn Gymnastics!