Blanket purchase order, incremental receiving, voucher 3-way matching

Purchasing 9.2 Image 43 PeopleTools 8.49.23

Scenario…we have vendor who is changing their invoicing model. They will be shipping a variable quantity each month to our warehouse without prior purchase order. This will be inventory items setup in PeopleSoft. We are considering creating a blanket purchase order with a large quantity set. Then with each receipt, we would receive against that PO line item and quantity. So incremental receiving. However, when we are invoiced, I am afraid there will be an issue with matching. I know you can set the PO to match action "No Match" but there are also match rules on the PO that