There are some devices on the market that can split an image into 2 (or more) wavelength components and project these side by side on a camera (examples are the Dual View and the OptoSplit). The SplitView plugin (under the Plugins | SplitView menu entry) will display the acquired images as a two channel Image in the 5D-Image viewer. You can set the color of each channel and use either a left-right or top-bottom split.
Split View dialog.