Never tried, but I think it is not difficult as the voice coil is connected to the diafragm and you can order replacement diafragms, so they could be changed by the user, I guess. But it scares me off too, to fiddle with the inner parts of a CD. I know there are drawings from the inside on internet, so they may give some clues about alignment of the diafragm.
My dad of 82 who never has said anything about the sound. Said when I first demo'd them to him: "The sound is perfect". My brother looked at me and said straight away: "Your last speakers ever". Every day I'm flabbergasted by the sound. I'm extremely happy. My son said last night: "You have outdone yourself" Not mine to take credit for though but good to hear nevertheless.
I could easily live with this speaker forever. But it is satisfying that there is still room for improvement in the midrange horn and in the crossover. I could get another pair of autoformers so the hf path does not have to pass through an extra capacitor. Etc. Im now also interested in rew and a mic.