It seems you already have your answers, but I'll add something for future readers. This powershell snip allows for auto-logon via the registry.
Set-ItemProperty -Path 'registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name DefaultUserName -Value "Administrator"
Set-ItemProperty -Path 'registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name DefaultPassword -Value "Password"
Set-ItemProperty -Path 'registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name AutoAdminLogon -Value 1
Set-ItemProperty -Path 'registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name ForceAutoLogon -Value 1
or can be done the old fashioned way.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"DefaultUserName"="Administrator"
"DefaultPassword"="Password"
"AutoAdminLogon"="1"
"ForceAutoLogon"="1"