@heygeorge Assuming your first device is connected to your Inspire controller is a device connected by USB then the best option you have is to either get a second monitor that can connect to the same remote by HDMI or get a second controller that you could connect the iPad Mini to using USB. Only one USB device can be connected to a controller at one time.
I'm hoping for a low latency stream with android to android directly in Litchi, in the Vue stream, you can enter cardboard mode and control the gimble with VR goggles while a pilot flies and controls the camera settings from the tablet as usual.