One night I thought that I'd try to see how it worked with some reflective 'something' to make it do just that.
I used some aluminum foil, I just quickly ripped a small piece off, folded it to where it would reflect, and it worked perfect.
(For the sensor, I ripped a hole for that)
I got it to work 360 degrees, so that told me that my cheap-o RC-1 would be pretty useful.
I plan on (possibly) making a mold of my camera in that area, using that mold to make a positive, the laying a thing piece of Plexiglass over it and heat it with a heat gun, that ought to work fine.
It'll be see-through and reflective at the same time.
I haven't really tested that yet, but, in the case it doesn't work, I'll use some polished aluminum plastic I have, I know that'll work 'cause it's almost identical to the foil I used.
I know, this is a little overkill sounding, but I do have all of the stuff to do all of the above if I want, it's just doing it... heh
Other than that, I also thought of a really quickie way to do this...
You could get a large paperclip, bend it to fit the camera, attach foil, or whatever reflective material you want, and it can be easily placed by into your camera bag afterwards, or, thrown away.