Will do Bucko!
The seller I got the custom cable from was:
“retro-ntsc” | Also known as “retro-square-shop”
Although the cable I purchased is no longer being sold. I can’t be certain cause I haven’t used it but the cable he currently has in stock doesn’t look any better than a generic cable. It even has the composite lead attached. It does come with the PAL required extras such as a resistor.
As for the OSSC. I will try this tonight and let you know. However I don’t think it will work. When you decrease the brightness on the OSSC I imagine it reduces the amplitude of the incoming luma signal as a whole. And because the signal comming in has already been clipped this will likely not change.