@miken79 , the Wear app is not a stand-alone app unfortunately, it requires the companion app installed on your device and that it be connected/close-by as the mobile device is what actually performs the network calls to communicate with your vehicle.
I understand with Android Wear 2.0, the Wear device themselves can now make their own network calls without the need for a companion app whatsoever, however adding support for that would require some amount of work I'm not ready to invest. I have other awesome Wear features almost completed that will come in the next release here soon as well as some other goodies, so to answer your request - soon.
@miken79 , ah yes be careful when choosing not to carry a fob. I've locked my keys in the office before and the easiest resolution was going 24 hours using the app to unlock and remote start the vehicle, granted I was well within city limits and my destinations all had good service.
However should you ever find yourself with no fob and no service in the car, check if your phone has service. If so, you can setup a Wifi hotspot on your phone and connect the car to it allowing you to remotely start it. I've done this a few times when driving through northern Idaho, not to remotely start the car but to stream music when AT&T service plummets but Verizon stays strong.