External Bank Account - Multiple DFI Identifiers

We have an issue where one of our client's banks (Bank of America) has multiple transit numbers depending on state.  Moreover, they have a separate transit number for wire transfers (likely because they have multiple per state).  The issue is that some of our external accounts are shared between AP and AR-BI and while AP only cares about the primary transit number, there is a requirement to print the wire transfer transit number on customer invoices in Billing.  Therefore, we need the ability to store both transit numbers and the external account only allows you to store a single transit