Yes, you are correct; you can't make changes to Form 4868. But your plan will work just fine.
Provided you wrote down your confirmation number, or requested it be emailed to you, you can use that number to look up, modify or cancel a scheduled payment before it happens. Select the option Look Up a Payment on the main Direct Pay page to enter your confirmation number and make changes. You have until two business days before the payment date to cancel or make any changes.
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