How can we make the account generator fire every time we press the Checkout button in iProcurement?

How can we make the account generator fire every time we press the Checkout button in iProcurement? We are seeing a limitation where the charge account will not rebuild when creating a copy of a previous requisition. Our charge account is being partially build using a custom projects DFF. Our understanding is that if we update certain fields on the requisition before or after Checkout (requester, deliver to, etc.) that the account will re-build itself.

We have discussed:

1) Making the Requester and/or Deliver To fields NULL and forcing a user to enter that data, thus triggering the account.

2) Placing a trigger, based off of when someone hits the Checkout button, that somewhere behind the scenes that will re-populate the requester (or one of those other field) values in order to re-build the account.