Whatever that doohickey piece is you can buy just them that screw together and are metal. Probably transferable to any elastic lacing.
Make your own.
You would not believe the amount of elastic cord that is available. Many colors. Even patterns. I just bought checkerboard laces. Because I’m weird like that.
And I wear Crocs all the time.
I’m gonna use my checkered laces for something else. Not shoes.