Hi there, I've used the 995 with the Nikon 3x teleconverter (actually a complete lens) and it worked like a charm. I'm assuming their wide-angle converter lens (the WC-E63 Wide angle) would work similarly.
These lenses screw to the threads on the front of the 995's lens. This lens converts to a 24mm-96mm. There is also a WC-E24 which converts to a 24mm-72mm. Both will block your view through the viewfinder so you'll need to use your LCD for composing your shot. The flash sensor is also blocked but you won't be using flash with this lens anyway. When the converter is mounted AND you've selected that lens mode on your 995, both internal and external flash are disabled. Vignetting is eliminated in this mode. (If you desire vignetting, simple use the stand lens mode.) I'd recommend locking the body so that the lens weight doesn't cause the camera tilt feature to swivel. Use that little slider on the bottom of the camera to do this.
Having said all of that

, if you're shooting products then I'd definitely use the standard lens and stitch the images as Mike suggested. You won't run the risk of any distortion that way. If need be, shoot three across and two up. Depends on the proportions of the item you're shooting of course. Also, shoot on TIFF mode so that you have use of all those pixels. Then size down if you must after all post-production editing is complete.