Rasplex has no X environment, that why you can’t find it, it doesn’t need it.
There are some old posts relating to touchscreen so, no one has got one working as far as I can remember, Rasplex doesn’t support touch, but the screen should work, suggest searching this section for ‘touchscreen’.
The touchscreen function is not a priority. I have search for many solution to have the LCD display working with Rasplex but I don’t find it yet. The screen works on Raspbian but there isn’t Plex client on it.
If anybody have a solution for this : Plex client on Raspberry + LCD screen working, I take it !
Just thinking about this would seem that an LCD screen with an HDMI port should work. Something like this ?
The only worry I would have is whether Rasplex would auto detect the display resolution. I don’t know if there is a way to force Rasplex to use the displays native resolution. Ned probably knows
I’m utilizing the 7" official pi touchscreen, running Plex Media Player v1.1.1 (the new 1.1.2 broke the touch feature, so I reverted). It works flawlessly! I tried for days to get rasplex to work with my touchscreen and eventually gave up, and I’m happy I made the switch.