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Just an observation I had with my FJ1200. If you use the sprocket with the rubber cushions, you must use a chain with the peanut shaped side links as the straight sided links will try and be forced out of the sprocket groove. It`ll wreck your chain in about 6-8ooo km. Yeah, I found out the hard way, and no shop had ever heard of this because all (I`m assuming) aftermarket sprockets don`t have the cushions.
Are you basically saying that the stock chain is the only option for this gear swap, or is there another aftermarket chain that won't get torn up prematurely?