Has this approach held up in court or survived an audit? Do you actually transfer the money to the employee's account? How do how do you prevent them from having a program to immediately wire the money to Zurich and run off, given that you have a non-recourse note for the stock that never got purchased?
[edit] I say small business because we do not yet have the 10-15% weekly growth required to be called a startup. Until you are expanding like a airbag, you are just fooling yourself that you matter by calling your company a startup.