Bank account and sort code field length restricted to 8 and 6 characters

I need to enter the bank swift code and the full IBAN but the account number is restricted to 8 characters, and the sort code is restricted to 6 characters. this prevents me from entering the account details in the standard BNP Paribas format and requires manual intervention. Open the fields to allow more digits or add new fields that allow the IBAN and swift codes to be entered. also, the payment currency selection is not available in the standard formats that we can export, the payment currency GBP must be specified in the banking file.