How to define SEPA debit authorizations for customer accounts instead of party

As stated in the documentation “A SEPA debit authorization is a paper or electronic document that authorizes you, as a SEPA-based creditor, or payee, to collect payments throughout the SEPA region by debiting your SEPA-based customer's, payer's or debtor's, bank account.”, that means SEPA debit authorization is linked to a Party, External Bank Account and Creditor so if a customer has several debit authorizations for same bank account all of them will be visible and available for all customer accounts and sites where that bank account is assigned.

For some business (e.g. insurance companies) is required to create SEPA debit authorizations for a customer account and not for the party (payee), but it seems it is not feasible in the application. How can we create debit authorizations to have them linked to Customer Account or Site, External Bank Account and Creditor? The idea would be to have a customer with different accounts where each account will have a unique primary SEPA debit authorizations which will not be shared with the other customer accounts.