I did some tests with a very cheap yet pretty well designed Cardbox type headset. You just slide your phone in it. The quality with just my Samsung Galaxy Alpha amazed me. we tried Litchi in VR mode on the slave controller for the camera man. Headtracking worked fine. It allowed the cameraman to be completely focussed on the task. I just had GO on the master, as usual.
I wouldn't fly my Inspire with a single controller and VR headset, never ever.
This is the one I got: 3D VR Box Glasses Virtual Reality Headset Helmet For Universal Mobile + Gamepad
Doesn't break the bank and allows you to determine if you really need, want it, at all.
This may be a stupid question, but I have this headset and from reading some other info, I thought FPV only worked if the image was split, like on google cardboard, so how does it work with the 2nd controller, this headset and the dji app?