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Regarding the mod needed to get CSYNC out of the French N64, it is basically a single 330 or 470 ohm resistor from the S-RGB A chip pin to a multi-out pin of your choosing. In practice, this has worked for myself, but to do this properly, some sort of an amplifier for the signal may be more appropriate to avoid loading the S-RGB A pin too much and dampening the edges of the square-wave signal. S-RGB A also has a pin for Luma, BTW, so restoring Luma is also an option (I don’t know about the required components to do that properly, though).