I have heard  of few people who had trouble living dual life. One of my friend a medical doctor by profession had to transfer all his property to his borther's name because he was an US citizen. He went to Nepal and overstayed his visa period. Later the government found out that he had a dual citizenship which Nepal government does not allow. Just to be on safe side he transfered all his properties to his borther's name.

One way to avoid this situation is entering Nepal from India. In this way Nepal government does not get any record of yours. It is risky but many Nepalese with dual citizens do that.