What kind of matte box solution have you got for situations when your GH2 is on a steadicam stabilizer?

When using a camera stabiliser (steadicam, glidecam etc) it's very unlikely that you are going to put the whole rig on with rod holder, rods, FF, MB etc --that's just too heavy, unless, of course, you have a steadicam vest - and most people here don't. Plus, there is the practical irrelevance of using a FF while the camera is on a stedicam (unless of course, you have a separate focus puller person who is using a remotely operated FF - most people here don't).

So the solution is often to take your naked GH2 and place it on the steadicam just as it is. The problem then are the flares. So I thought of getting one of those rubber lens shades that can be easily stuck to the lens, but the problem with those is that they are not always catered for wide angle lenses.

My question: have you ever seen a rubber lens shade that could be attached directly to the lens, but at the same time have collapsible increments like this?