This may not satisfy the look you're going for, but since you mentioned custom hacks... If you have a router, you could make one out of wood.
I created mine as basically a picture frame. It's nothing more than a rectangle of wood wirh a recessed area for the Plexiglas and marquee to slide into. I keep it in place with actual picture frame tabs on the back that protrude onto the Plexiglas but not beyond the recessed window (otherwise you'd see the silhouette of the tabs).
That is one option if you have access to wood and the tool and don't want to wait on shipping.