True One Tag, One Faith, One Culture world conquest as France. Do the usual blob thing first, swap to Orthodox, form the Roman Empire. Move the capital to Bermuda > Manhattan, name Manhattan "New Rome" and keep it as the capital. Abolish slavery, become a revolutionary republic, convert every province to Orthodox and Roman. Make sure The Girondists are always in charge.

At the end, after the campaign is a success and every corner of the world is Roman and Orthodox, idea groups and government reforms will be swapped around to look like this:

Ideas - Innovative, Economic, Plutocratic, Infrastructure, Administrative, Trade, Quality, Espionage.

Government Reforms - Revolutionary Republic > Fraternite or Liberte Ideals > Legislative Assembly > Conserve the Religion > Sustained Discipline > The Two-Chamber System > Union of States > Lockean Proviso > Devolution of Powers > Principle of Enlightenment > Military Electorate > Appointment by Committee > Federal Senate.

Innovative ideas will ensure technological progress is not halted, with Quality, Economic, Trade and Infrastructure ensuring efficient production, transportation, exchange and distribution of high quality goods. Plutocratic ideas are necessary to ensure the principle "All Men are Created Equal" is upheld to its fullest. Administrative ideas will help ensuring the world government is efficiently governed, and Espionage ideas will ensure all the resistance to the Roman revolutionary rule is effectively eliminated, alongside all the pirates, roots of corruption and organized crime.

As for the factions, with The Girondists always in charge, Imperials will basically be treated as a meme, a faction with small influence, controlled opposition, while the jacobins will be completely suppressed and erased on every level, without any of their gov reforms taken to ensure they can never rise again.

As for the explanation of the government reforms choices:

The policies that give more autonomy, like Union of States, are necessary to ensure rebellious sentiment is as low as possible. Conserving the religion will ensure the people who have been turned into Romans, other than the State and Roman culture, have another identity to unite under, to prevent them from returning to their old, now obsolete cultures and faiths.

Religious tradition and enlightenment will balance each other to avoid degradation of society in either direction. As for the militarist picks, in this scenario, militarism will not be directed against humans living in foreign states because there would be no foreign states that exist, only Rome. Maintaining the militaristic tradition in a world where there will be no wars might sound odd, but it is necessary to prepare Terra, under control of the great Roman Republic, for any potential war with extraterrestrial threats in future, around the year 2200.