Spuhr AB is a Scandinavian company that specializes in high-end scope rings and scope mounts. Their rings and mounts feature the SPUHR Interface, a mounting interface that allows accessories to be easily bolted on (you can see the interface on the photos below).
At IWA ’13 they had a very nifty prototype accessory that allows an image intensifier to be mounted on a rifle without a full length rail. The extended cantilever mount bolts onto the Spuhr scope mount. This setup allows law enforcement and hunters to use image intensifiers on lower cost rifles like a standard Remington 700 without having to pay for a very expensive (and heavy) stock/rail system.
I wish I had thought of this idea!
Many thanks to Dom for the photos and information.