Keep VP planned order date with new convertible planned order is created

We have some finished materials that we are using strategy 52 to forecast and purchase the raw materials before sales orders are received.

We are trying to limit sales to our forecast both with quantity and date of production, but only when we have the order in hand.

is there a way to make make the convertible planned orders that are created once a sales order is received match the PIR (VSE)'s planned order (type VP)

example

item 1 has forecast of 10 on 10/5/20, sales order comes in with request date 9/15/20 for 5. I would like the planned order the MRP creates to still have the 10/5/20 date.