I don't think you would have to hack up the fascia at all, just unscrew the screws a bit, and you should be able to turn the empeg upside down, and shake it a tiny bit and the lenses should just come out. The only thing that would hold the lenses in is the edge on the fascia. You wouldn't want to hack that off!

EDIT: there would also be a gap under the right button in the lenses.