You say: "But enemas should really only be done in emergencies..."
I'm sorry, but I disagree with this statement. For most people in reasonably good health, a properly administered cleansing enema is a safe, natural, and effective procedure.
Enemas are a time tested tradition in fasting and have provided many of us with welcome cleansing and relief. Enemas are not in general considered to be an emergency procedure. Severe fecal impactions are exceptions, but this isn't something that typically occurs during fasting.