Ok so I've built a low poly model of the shoe.. and i wanted to experiment with different setups for the movement.
I have tried one method so far being the spline IK setup
It's simple to control.. as its basically only one spline ik handle.
Problems - might need to create the bottom controller and to get the shoe to be able to twist.. which isn't possible with spline IK
Straight forward spine IK next try.