I was just about to post this! It IS an odd combination. And if you want to talk about REALLY odd, Sting had a Hamer fretless Explorer 8 string!
That extra switch looks sketchy. A Spoiler Exploiter like this would typically have vol/filter/PU selector/Q switch. I've never seen a lone treble switch without a bass switch. But as we all know, it can be anything goes with Alembic.