Teams Operator Connect

I have setup Teams Operator Connect and one user serves as the Main Line Number and the others have there own DDI number, I need all outbound calls to shows as the number assigned to Main Line User.

I know that this can be done if you unassign the number and assign it to a resource account but the customer doenst want to do this as it gives a delay on calls.

Does anyone know of a way to do this via Teams Powershell etc..