How to display the LR mobile camera on external display while I take photos on iphone

I am taking photos of myself using a bluetooth remote and LR mobile's camera. I want to see the viewport on the phone on a larger external display while I take the photo. How can I connect say my Macbook Pro so I can see the camera viewport on my macbook pro while taking images using the bluetooth remote?

I tried Aircasting using an app called aircast but this disabled the use of the bluetooth remote (aka made it so when u click the top volume button it increases the volume instead of takes a photo).

I tried mirroring my phone to my macbook but two problems, same problem as using aircast, and also, cant rotate the screen to landscape. 

Any ideas?