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Uber tarty, If you want them at a reasonable price you probably want to stick to my super simple model, which works fine and is <4g at 23.5mm OD. Total price for 10 is probably going to be the same as for 6, the spindle time is so short that nearly all the cost is programming it. This one will turn down to 22mm safely, but I could bring the lightening holes in a bit if you think you're likely to need anything smaller. Carbon 1⅛" steerers seem to fall between 23 and 24 ID for the most part.
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Between 6 and 10, depending on the extent to which the unit price varies with quantity, if at all.
This is the last one I made, for @Cycliste's singlespeed bike.