It would be a bit warmer, but it wouldn't be the same weight. Not only the noseeum baffles, but you'd need more down as well. Close to the same weight, but it would still put it over a pound.
Regardless, if it's what you want then run with it! I'm sure someone on HF would make you one if you pay enough. Or maybe JRB will eventually offer a 1" version.
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