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My two cents on the topic: having tried V-levers with canti brakes multiple times on multiple setups, I would really and I mean really advise against this. I currently have a proper high-end Tektro V-lever matched with LX cantis on the rear end of my Rockhopper, and even with brand new Kool-Stop pads the braking force is rather crap compared to when I used a proper canti brake lever. I can stop if I pull hard, but I weigh 60 kilos and don't usually go very fast...
V-brake pulls a lot of cable but with small force, canti is the opposite. Won't work well if you mix em up. It's acceptable for when there's no other option I guess.
Well, the v brake lever has a larger cable pull than a canti one, so you lose a bit of “modulation” but that’s much better than running the opposite setup like ffm describes.