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S-video and RGB would probably be the easiest to implement. If you are inject S video just after the split the factory delay line will be right and RGB injection will also keep the 3 video signals in time with each other. Y/Pr/Pb I've seen someone try to add to a roundy...They didn't have the patience to make a custom Y delay and couldn't find an injection point that would give them the right delay so luminance lead chromanace in being scanned on the screen resulting in color fringing effects....
Some of those HDMI adapters had the ability to switch to RGB IIRC. You also might be able to find a HDMI to VGA converter that supports 480i which would give you sync outputs.
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