Set Approval Queue Rules by Bank Account

We have a client where we handle their personal books under one client code but each spouse has their own pocket accounts. They would still like to see and approve everything running through those accounts yet they would like to approve their own transactions without the other having to see their activity. It would be great if we can set up approval queue rules by bank account to accommodate for instances like this. This would also be helpful for things like household accounts where there is a need for the house manager to approve invoices run through that account but not see other activity for the other personal bank accounts.