These reusable “guardians” work pretty well.
Come in a variety of colours & more comfortable than they look on daily wear.
I found moving the buckle adjuster closer to the sensor cradle strap slot got me forgetting it was there.
I used to use a version that also cradled a BT bridge back in the Libre 1 days?
A small child might try the cradle, but the sensor should be safe by the time you stop the kid?