Override purchasing cost method, based on order type

Normally, when we create a purchase order the cost assigned to the order comes from cost method 08.  However, for direct ship orders (OD), we need to have the purchase order cost based on the standard coat method (07).

I tried using Advanced Pricing for Purchasing to do this but it would not let me setup and adjustments for purchasing that use costing basis code or a cost method.

Is there anything else I could try?