I may be a bit weird in that, i don't like to see led's when they are turned off. i'm always looking for ways to achieve this goal and today's experiment turned out well.
here's a close up of the top of the pedal with the light off :
If you look really hard under the letter above you'll see a small bump.
The trick is :
drill into the back of the enclosure slowly while looking at the front.if you drill slowly enough you will see the bit come through the aluminum.stop before the drill bit pierces the powdercoat.
now, take your led, sand the end flat and glue it into the hole in the aluminum. wire up the led as you would normally.
you may have to experiment with dropping resistor values for the led to be bright enough to be seen through the powdercoat but, if you're using super bright led's,chances are, you'll be good to go.