Is it possible to remotely wipe a lost iPhone without having it linked to iCloud/Find My iPhone?

Is it possible to remotely wipe a lost iPhone without having it linked to iCloud/Find My iPhone?

Added (1). I know Find My iPhone has a remote 'erase data' capability, but I never fully set up Find My iPhone before I lost my phone. Have any of you been through this? Can Apple wipe it for me? I've since gotten a new phone, but I'd like to wipe the other one if at all possible.

Nope. There would be no way to do so otherwise.

No you can't. Apple only wants you to use their tools, and they don't like apps to mess around with the iOS system. If you had an Android phone, you could do that if you have an antivirus installed.