Even if you could keep carbuncle he would be completely useless to SCH if kept the way he is, WHY would you want to keep him that badly? Besides, EOS is a champ imo, i don't know any sch that would give her up for carbuncle. (- this thread)
If you are that desparate you can always take off your stone, of course you know the negative impact that will have on you for just cosmetics.
