Something I try to spread general awareness for whenever someone posts a local account workaround:

The easiest and most foolproof workaround to get a local account is to attempt to use a banned account. Someone conveniently got "no@thankyou.com" banned so if you attempt to log in with it (use anything for the password, you're not actually trying to succeed in logging in) it'll dump you straight to the local account screen since they don't want a disabled user to create a new account.

Unlike other workarounds this is intended behavior so not only is it easy to trigger but it's far less likely to stop working when the installer is updated again.