Copy / Paste Style to Level Options

Is there only one way to apply a saved style to a level by copying and pasting it, or is there a keyboard shortcut method I’m overlooking? I’m fine with copy / paste, but I wanted to make shortcuts if possible.

You can use the inspector to apply a named style to a level style. Make sure the level style is selected and the styles list has the focus (the selection is colorful rather than deemphasized), and use the Included Styles popup at the bottom of the Style inspector: