I did it the other way around with the middle. Put the carbon-steel ring on a older 760. I had to put chainring spacers to get it centered, so I guess it won´t work very well if you try the oposite (can´t remove material from the ring to get it centered) but you might try.
"Blessed is the man who, having nothing to say, abstains from giving us wordly evidence of the fact." George Elliot