I'm sorry, I'm still very new, and I don't know everybody's areas of expertise, so don't take the question as a challenge: are you a medical professional, or do you have personal experience with this particular medication or other antipsychotics?
My experience with off-label uses of anti-psychotics is that you can in fact take them (some of them, anyway) as needed and therefore the concept of 'cold turkey' doesn't apply. Source: a prescribing doctor informed me of exactly this. I cannot speak on risperidone specifically, so maybe I'm making an over-broad assumption about anti-psychotics when I suggest that it may also be possible for risperidone. YMMV. JMO/IME. IANAMP