I too have the Speaker LED's on order...and a '17 model. One of these great ideas should work fine. Thanks' for this info!

That 'spare' 12-volt socket mount didn't elude me and I've toyed with ideas to fill it (BMW-type socket for heated vest, USB, etc.). If I discover only a single position for the headlight switch, guess I know how it will be used!

'17 M3W:
'08 Ural Gear-Up