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With the French N64 model, there is also the option of pulling CSYNC from the S-RGB A chip (pin 18). This could be connected to the unused Luma pin of the multi-out connector and you could use a sync-on-Luma cable. You just have to keep in mind that Luma is supposed to be a maximum of 1 V peak-to-peak (or was it 0.7 V, actually?), while CSYNC is TTL (5 V peak-to-peak), so you need to drop the voltage. Also, you should avoid pulling too much current from the S-RGB A pin. A resistor with the proper specifications should do the job in practice, but you may want to do something more sophisticated for various reasons.