This probably won't help.
Years ago I cut a 1 1/4 carbon steer tube for a friend. The piece that I cut off turned out to have exactly the right diameters for 1" steer tube custom stack spacers. I don't know if there's any weight saving, but they look good. I probably still have 20mm or so left in my shop.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.