2) Cash bonus would be dependent on employe exercising the grant.. it probably shouldn't be presented as a bonus, so the employee doesn't have to select between the bonus or the stock. If they prefer a cash heavy compensation package, that should probably be discussed in isolation from a stock purchase reimbursement / bonus.

3) This is a tough question. If an employee leaves before 4 years, the company has to buy the restricted stock back from the employee. Perhaps there's a way to legally require the employee to return the buyback check to the company.