Is there a way to "approve" a PO when it is outside the price tolerance? Using an Exit program or cu

In R12, we now have the ability to automatically approve a PO if it is within a Price Tolerance range set by %. However, our Sourcing department wants more functionality. Instead of rejecting a PO if it is outside the Price Tolerance range, they are asking if we can have it prompt for an Price approval, where the buyer has the option to accept the price and approve it. Is there possibly an Exit program that can be accessed to add this logic or is there a workflow that can be built to add this functionality?