I ran into the same issue and was stuck until I paid for LEDBlinky and came up with a hacky work around. When Big Box starts attract mode it sends the "FE Screen Saver" event to LEDBlinky. You can run an external program when this event happens so here is a work around.
1) Install CURL and EventGhost on your Big Box machine.
2) In the paid for version of LEDBlink setup the "FE SS" event to run this external command C:\curl\curl.exe "http://localhost:10000?event=updateimg" and run it hidden.
3) In GhostEvent create a macro called updateimg. In the macro create an event called HTTP.event=updateimg. In the same macro add a "wait some time" w/ 15 seconds parameter and emulate Keystrokes {down} action.
The end result is Big Box starts attract mode which sends the FE screen saver signal to LEDBlinky. LEDBlinky uses curl to send a message to EventGhost to run the updateimg macro. This macro waits 15 seconds and then emulates the keyboard down arrow and abra kadabra the pixelcade now appears to be updating with attract mode. I prob forgot some steps in setting up GhostEvent as I originally installed and configured the webserver to allow me to mute and unmute my arcade with my Alexa. Hope this helps!