If the Noble Lord suggests that we emulate Britain, then I therefore suggest to him that we start by actually emulating Britain.
1. The capital of Japan shall be the Imperial Capital, namely Kyoto.
2. Slavery shall be illegal in Japan.
3. Shinto shall be formally separated from Buddhism, and become the state religion of Japan*. Other religions which have historically been apart of Japanese society and tradition, such as Buddhism, shall continue to be tolerated.
4. The Emperor shall be the head of state and have the final say in all matters of state.
5a. The old provincial/han system is to be abolished and replaced with a more modern prefectural system.
5b. The Daimyo shall retain their titles and property, and the rights of administration over their hereditary residences (castles, etc.) but administration of the prefectures of Nippon shall be handled by the Emperor or elected officials.
6a. The Daimyo of Japan, along with Princes or other members of the Royal Family, as well as other individuals given special right to do so by the Emperor, shall have the right to sit in a new legislative body modelled on the British House of Lords, serving as the Upper House of Japan. Their seats in the House of Lords shall be hereditary, awarded on the basis of hereditary title, and shall pass to their heirs along with said title.
6b. An heir to a peerage shall have the right to sit in the Lower House, provided that he wins an election to said body. Upon inheriting a title he must move to the House of Lords.
7a. The nation shall be administrated by elected officials who serve in a new legislative body serving as the Lower House of Japan. Japan shall be divided up into roughly 600 constituencies according to population, with each constituency electing at least one MP each.
7b. Anyone may stand for election for the Lower House, except existing members of the House of Lords and the Emperor himself.
7c. The Lower House shall be elected by any Japanese who meets the necessary property and literacy requirements, as defined by law.
7d. The Lower House shall elect a Prime Minister, who shall serve as Head of Government at the Emperor's pleasure.
7e. The Prime Minister has the right to form a government and a ministry of his choice, but on all appointments (including that of the Prime Minister himself) the Emperor has the final say.
-- Hosokawa-dono
((*Shinto as a religion separate from Buddhism hasn't been a thing in Japan for about a millennium by this point.))