Not really.
LCDinfo loads the Screens.xml at startup, not one of the screen files. You could remove all of your other screens from the screens.xml file.
Or even better...
Create a batch file that swaps the screens.xml file between two versions. One for your normal setup, and one for just your media player of choice.
Copy your current screen file to screens1.xml
Create a new screens file called screens2.xml
Then create a batch file that copies screens1.xml to screens.xml and starts LCDinfo. Call it Current LCD.bat
Then create a batch file that copies screens2.xml to screens.xml and starts LCDinfo. Call it MediaLCD.bat
Anyway.. all of that is theoretical... play experiment, ask for help... and let us know how you go.