Problem is direct debit info is NOT listed on a form 1040 ... permission for the IRS to debit the card is sent for that one purpose only. I have not seen any confirmation that they will use that DD info for the deposit of the stimulus check.
In fact I believe they will not since the account you use to pay the IRS doesn't need to be your bank account and/or it could be a credit/debit card that is either not yours or will not accept an IRS deposit.
In short it is currently unknown if this will happen or not ... In my opinion :
ALL EVERYONE CAN TO IS WAIT AND HOPE FOR THE BEST .... if you have already filed a 2019 return there is nothing you can do until something happens no matter how much you wish and pray for a miracle ... there is no fairy godmother with a magic wand to help you now.
If you get the DD in the next 2 weeks then you are done. Be happy.
If you do not get the DD by the time the IRS finally opens the promised portal then you can update your information at that time.
Follow this site for updates:
CORONAVIRUS TAX CENTER: 2020 STIMULUS
https://www.irs.gov/coronavirus
