1. You might be able to try feeding a double scan image.
It's probably worth a try.
2. Don't get confused between:
I) Composite - basically luma+chroma mixed together, which is rgb all mixed(+sync)
II) Luma-Chroma - two signals, 'Luma' is for the brightnes, and 'chroma' is for the difference of blue and red, compared to the brightnes, which is sort of green. don't ask me exactly how it works
III) Component - component has the same basic 'Luma' signal as above, but the chroma-red, and chroma-blue signals are different
IV) RGB - Seperate signals(wires) for red, green, and blue
Remember also that there are the analogue & digital versions of all the above except I (and probably II too)