well if it were me....I'd get a small piece of "L" shaped aluminum (sp?) drill a hole to fit a fastener for the camera mount to the aluminum. then get two nice RIS flash light mounts, and tap the holes for the other side of the mount for your RIS....then wham you have it for about $20.00
If you need plans I can try to do them on paint and upload for you.....
Good luck post up some pics when you get it done.....Oh and some blcak or camo paint for your mount...