Y/Pr/Pb modifying an old NTSC set?

[lnx64]

This is something I've been interested in. While it's fairly easy to RGB modify a TV with an on screen display (or closed caption decoder for that matter), older sets that don't have OSD's and analog tuners tend to seem, to me at least, like it could be possible to inject Component Y/Pr/Pb video internally somewhere, or at least S-Video.

I want to use my old Samsung set I used to use years and years ago again, but want at least S-Video or Component input.. The tuner will not be used again and bypassed completely since there's really no point to it anymore.

RGB would be nice, but I decided Component or S-Video because getting HDMI converters for that is far easier, and I can just use an HDMI switcher. Short of bypassing the tuner so I don't need a modulator, it would at least give it a FAR better picture than it ever had seen before by bypassing the comb filter entirely.

Samsung C9110MA. Uses a K20 chassis.