I'm not exactly sure what you're up to
The following test displays have been implemented:
Line "99": all green/black
Line "98": Chessboard
Line "97": software version display
Line "96": complete font display
These test displays override any other setting that has been made for line/destination or route.
Destination displays that change every few seconds are not possible with the given scripts. (That means, they are possible if you change the matrix scripts and the depot file structure).