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Steel won't be as rigid as aluminium so flange flex might actually be a thing
Steel is about 3x stiffer than aluminium so a more slender flange (euf?) will be about right.
This is an interesting project, I know this is used for repairs by a lot of the big aerospace manufacturers but often with post-machining to get the right surface finish. As you have more design freedom I'd try to come up with a design that couldn't be made by conventional means, how about a hollow flange (thin wall but wider cross-section)?
Screwball
@drøn
Steel won't be as rigid as aluminium so flange flex might actually be a thing.
How are you planning to bond the flanges to the carbon tube?
Will the threaded part for the cog/lockring be part of the flanges or separate?
The bonding and carbon tube need to be able to transfer some torque to the NDS flange, that's why I'm a bit sceptical to composite hubs.
imho.