Disabled Google Account Issue

I have a personal Khan Academy account that I made using the "Sign Up With Google" option. I selected my school account to sign up, but now that the school account is disabled, I can't link a separate password to it since I have to confirm using the disabled school account. Trying to confirm your identity to change your password using a disabled Google account does not work, as it will just say "Your account was disabled by your Google Workspace Admin."

Is there a way to link anything to the Khan Academy account without using my disabled school account?