You can always run it for one user, this command can be launched by a regular user and will include the application when launched only for this user.
REG ADD "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "My App" /t REG_SZ /F /D "C:\MyAppPath\MyApp.exe"
You cannot add something to the local registry key to start the computer, but at some point you are not running something as an administrator.
For the Another Task Scheduler option, you need something to run as an administrator to add a task.
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