2- Reverse engineer your Gear VR and manufacture one
3- Write a Gear VR emulator for you PC
4- Make friends with someone that owns a Gear VR
I believe Oculus has dropped support for the Gear VR. Are you developing an app, or just want to play an existing title? If you just want to play a multiplayer title you're gonna need a second headset or friend someone online with the same app.