No, there currently isn't any way to disable candy skins without also cancelling the effect.
Is this supposed to be a suggestion? Because you posted it in the suggestions forum.
So, on NotAion / or before Aion evolution, there were a command like /cancelmorph or .morph to disable candies apparence but keep the stats. Dunno if its possible in 4.8 tbh.
We discussed this at our last meeting and accepted the proposal.
A short and rough check of the data showed that something like this should be possible. You can find out in which way you can later use this function in the corresponding update news, with which this adaptation was implemented.