How about an option, then? Or the ability to let us install an appropriate part ourselves (that might already be possible without having seen your box). I'd probably be willing to pay an extra $5-$10 for a jack instead, just for the tidiness.

Out of curiosity (and I know I'm getting ahead of myself and you), have you considered routing the face of the unit a little so that the empeg will sit more-or-less flush with the face? Shouldn't be a big problem as long as you're using reasonably thick MDF.

Of course, I could do all of this myself, but I'm just too lazy.