It’s not available yet.
Most people (myself included) have just moved the direct debits manually and found that is isn’t as bad as it may seem. Most can be done on the company websites in minutes and there were only a handful that needed a phone call to be changed.
Admittedly being in a call centre queue for those few is not a good use of your time but my advice would be to just get stuck in and you’ll done in no time 