I just made my own cable and hacked a DB9 into the back of the Saturn. Compared to a Duo this is dead easy. The SCART connector design is kind of a POS and most aftermarket cables I've seen aren't even up to the very low standard set for them by 1970s French engineers.
Personally, I'd rather manually switch a cable than pollute the signal (and air) with a pile of smelly sub-Harbor Freight plastic and shitty wiring.