If you have a button on the Skip 1s you are not using you could turn it into a macro to toggle eArc on and off in the LG menu. For example say you don't use the number 7, you would assign commands from your LG TV settings>menu down>menu right>ok>settings. Or whatever commands you use to get to the eArc setting to turn it off and on. You might also need to add some delays between the steps depending on how responsive your LG is to IR commands.