To say the OSSC is complete would be a bit of an overstatement
It really wouldn’t.
OSSC was conceived as a replacement for the ageing XRGB2 and 3 processors rather than a replacement for something like a Framemeister. I always chuckle when we get the odd return because “it doesn’t work in 3x mode”. No line doubler ever tried line tripling in the past. You either used your monitors scaling to go from 480p to native res or a second processor.
As for transoders and s-video support, we’ll have a better option for OSSC users soon.