How to remove bylevel symbology of all levels in one go?

For one client I have to move all elements in references (i.e. topography is in one reference, telecommunications in another)  to one level (i.e. topography should be on "level 1", telecom on "level 6") and then merge all references in one file. Now each of these elements use bylevel symbology (style, weight, color). I know how to remove the bylevel symbology for single levels (key-in: level element bylevel unset color + level name). I also know how to remove it from levels that are named level 1 to level x by just adding level*. I just don't know how to select ALL levels with different names at once. Anyone up for a key-in solution?

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