Yes, you can change your payment method after setting up a Direct Debit; however, you'll need to cancel your existing Direct Debit first. This can be done by writing to your bank or building society, and it's advised to also send a copy of your cancellation letter to the council. Once you’ve canceled, you can set up a new Direct Debit with your preferred payment method.
For more details on setting up a Direct Debit, you can refer to the Set Up a Business Rates Direct Debit page or the Paying Council Tax page.