Hi ChrisLear , welcome to the forum. I don't recommend your suggested approach. What you could do is add identifier values to all the supplier records, eg B for Bpay and D for direct credit, then I believe you can filter the report accordingly. The editing can be done via export- import, take a backup before any major import.
I'd also recommend using the reconciliation versions of the aged payables and receivables reports, where the date is a true cut off. People are often confused when eg April invoices appear on their "March" aged payables.