No, they don't and why I cannot imagine. My two Nikonos III cameras were light, small, compact, durable with superior optics. Now all we get is cheap P&S and dSLRs. I hate dSLRs. My Nikonos III rigs were smaller and lighter than my Canon 570 rigs today and of course were far more capable but I could only shoot 36 exposures and could not check my work until I got home, oh well. We live in an age of a one year obsolescence cycle and plastic dSLRs that get one drop of saltwater on them and the magic smoke comes out. Try putting that back in, good luck.
While I agree that the wide angle lens (the 15 mm) for the Nikonos was superior, the idea of using a framer for macro is a complete joke. Here's how it went typically, let's guess at the distance and the exposure and now put the face of the little fish between these two plastic bars then press the button. Yes they were small (but with strobes and arms not that small) and had arguably the best wide angle lens ever, but they also flooded a lot and in general (other than the RS) used 1950 technology. The reason that Nikon bailed was that there would be no market in such a technology. But for those of you with too much time and some killer engineering skills look at
Digital Nikonos Industry Design Challenge :: DivePhotoGuide.com - The Underwater Photo & Video Portal
I would bet that there will be no winner except maybe for the lens adapter system. If you want to shoot film, I would guess that Chris Newbert has a garage full of subeyes that you could get cheap.
Bill