Read just now that the SX32-Pro expansion for the CD32 has a 23-pin Amiga video out and a 15-pin VGA out inbuilt.
Strange that the standard unit didn't come with the 23-pin port though, consoles like the Sega Megadrive/Genesis allowed for RGB from a DIN socket next to the RF out.
Does the CD32 have a yellow composite phono output though, if not then some kind of S-Video/SVHS-SCART cable might be needed.