API PATCH for Amending One Employee's Payline in the Payrun

To change a single pay line on a single employee, I have to request and re-send the entire massive payrun object every time and risk altering the ENTIRE pay run for the month. For 350 employees this comes out to 10,000 lines of code. Having a PATCH options for just the employee or just their pay lines would be a huge relief, or PUT endpoints for the employee or employee's paylines in the pay run.