OK, could I recommend a suggestion something like having an 'Update pricing' button within the Edit Order function, to work just like the existing ability to 'update item information and pricing' when an order is copied within OE? Would something lke that meet what you were looking for?

Do you send Order Confirmations to your customers, with prices? If so, I imagine there is some process already in place when the price changes and the invoice prices doesn't match the confirmation.