There is another option with the BT-200. I've got the BT-200 glasses and a Phantom 3 pro. I've got the HDMI-out module for my Phantom controller and I purchased the HDMI converter from Colorado Video. It's a little complicated, but you end up plugging the glasses into the Colorado Video converter and plugging the converter into your controller with an HDMI cable. I used double sticky velcro to mount the converter under my controller.
This gets me the direct HDMI output from the controller on my BT-200 glasses while still having the DJI Go app running on my smartphone. It's the best of both worlds!
I can give you more information if you need it. (i'm pretty sure I did a review of this stuff somewhere on the forum if you search for BT-200!)
Good luck!