I think the answer to your first question is the fact that his bill relied on his place in the Syndicate. Unanamo abolishing the monarchy would also strip the monetarists of power and rank, and if they wanted to try and regain the power and rank they would have to essentially run for office. Like if the Queen of England decided she would try to create a democratic republic rather than a monarchy, Parliament would lose their power. As it stands, Unanamo is a figurehead at the mercy of the Syndicates wishes.