Bank conversion using Customer Interface is pretty straight forward , as you listed... just populate the mandatory fields
• ORIG_SYSTEM_CUSTOMER_REF - Customer Id ( for which you are provind bank accout details).
• PRIMARY_FLAG - 'Y' if its primary bank account for this customer
• BANK_ACCOUNT_NAME - Any name to identify bank account
• BANK_ACCOUNT_CURRENCY_CODE - Currency
• BANK_ACCOUNT_NUM - Account Number
• BANK_BRANCH_NAME - Name of bank branch
BANK_NAME - Name of Bank..