This is a great idea!
Have not been bringing our lights to gigs. I think this easy setup could change that.
Update - done a few gigs with the lights mounted to the speaker. working great! we bought a cheap lighting truss on eBay and cut it in half. Plenty of room to mount three lights on each truss. We also mounted velcro onto the side of the speaker for a power strip for the lights.
A great compact setup that lets you point lights at the band and audience. We are using wireless DMX and it is working well. We've also put some uplights at the base of the truss. Add a white scrim and its a cool light show!