FinancialGateway use for multiple Bank SetIDs

Hello Experts,

We are implementing FG in 9.1 with other Financial modules upgrade (8.9 to 9.1). We would like to use the FG for AP & AR payments dispatch. Multiple AP BUs using only 1 ACH account# setup under 1 setid (SetIdA). AR has multiple BUs and they are using ACH account# (Same as AP) but these are setup under different setids in Banks->External Accounts (5 AR BUs using 5 External Banks setup with 5 setids but with same account# & Routing/DFI number. This is due to different ChartFields being used for these 5 AR BUs for Reconciliation & Reporting purposes). AP