Probably not as much as the persons behind all the references I shared, but thanks 
Then, thinking about a short term solution, a sync extractor with monostable blanking is what would make the most sense, doesn’t require much circuitry (LM1881, 74HC4538, 74CH14, maybe a few op amps if 1V front sync/16 pin cable sync is required), most of the output of LM1881 can be buffered directly, except for blanking that needs to be derived from csync with monostable, then hsync could probably be subbed by csync without issue. Else, LMH1980 is worth considering, as it has hsync already, it is SMD but since LM1881 in DIP format is now obsolete, that can be a good option.