one default settlement account for multiple treasury company profiles

How can XTR be setup to support multiple company profiles that enter XTR deals to use the same bank account for the default settlement bank account? Root cause of the problem is that only one legal entity can own bank account number 554433. Bank account 554433 is a concentration account, that makes all of the payments to settle treasury transactions. The requirement is that 5 XTR companies issue debt (5 Term Loans), entered in XTR as 5 Wholsale Term Money deals.