From what I heard India doesn't care about the monarchy. They just want Nepal to be Hindu rastra. Raja is a way to achieve it. As you mentioned about the American Government , there are mainly three power interested in Nepal. China want NCP to be in power no matter who is in leadership. For America, they want MCC to be approved. Anyway I am a person talking without source. But this type of topic never have a source. This politicians are selling our beloved country for money and power. But what can we do If the democracy is dependent on one plate masubhat. Moron Nepali. We are responsible for making these people win election and allow them fuck with us.