As I said, most of the legal fraternity regard employment contracts in the same regard as an ash-tray on a motorbike !!!
Yes the covenants can be written to survive the actual contract, but we then get into a fully blown legal argument that is beyond those of us here (except Flying Lawyer perhaps) to establish if it can be enforced. In most cases it is better to just live with what your former employee is doing. Should the unthinkable happen my plan of attack is not to try and enforce a cotract, but to discredit the individual concerned quickly in order to protect my job. I therefore need to know what the little turd is up to. Simple really.