I have no additional information on the first generation lens.
However, looking at photographs the knobs look the same, although both are silver.
I have a Nikonos 15mm ver2 which I have as a parts donor.
Send me a PM and I will donate the knobs, control shafts and screws for your project. You could then drill out the seized ones and hope for the best! I don't have o rings, but there is a fellow on Ebay in France who sells them.
They did a great job; distance correction upper, plain glass lower.
Find a mask with tall lenses (e.g. Scubapro Spectra) to give more real estate.
I also had them bevel the lower edge of the upper corrective part, so looking downwards I am looking along the bevel, rather than across a flat, distorted transition. It gives the impression of no correction and makes more of the surface useful for vision.