How to include the supplier email address that po was sent to in the po approval notification

I am resending the PO Approval notification to email addresses other than the supplier email address was originally sent to.

I need the resent notifications to hold the supplier email address it was originally sent to.

1st idea was to personalise the notification region by creating a new item from PoNotifHeaderSummaryVO.

This won't work because that VO based on po_headers_xml doesn't hold the supplier email address that the po was sent to (even though it is on po_headers_all)

2nd idea was to change the workflow message AME_EMAIL_PO to include the 'Email PO Performer' attribute in the body of the message