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They just bolt the inner ring to the middle ring so you're stuck with the 39T middle ring they give you. Not to mention the 74mm offset 4-bolt pattern, no-one makes a replacement other than shimano so you're stuck with the 30T too.
But you probably knew this already, hence making the sensible bodge of the 6603.
For now. we've got to band together and #influence the bike industry towards nice, hollow-axle, ultra-compact cranks that aren't £300. Maybe time for 46/30 Sora cranks?
(not taking the piss, I would 1000% ride super-compact Sora cranks if they would bloody make them )