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Yes, this is true... I think the axles can be sent to Rotor to be detached but not sure. I wasn't 100% sure about the anodising job and the little pock-marks on the 3D+ cranks anyway, hence the decision to bite the bullet and just get something new.
If anyone's interested in the silver Rotors then hit me up - you can get the correct spider easily enough and the wonderful people at Bespoke Cycling can switch it over for you. They did it free of charge when I went : )
The spider is detachable but not the axle as far as I'm aware, and it's the axles that came short for a cervelo specific crankset.