Padmé and Leia would be British princesses.
Luke would be from Turkey or a 3rd World very sandy country, same as Anakin. Han Solo, a smuggler from the US, would smuggle Luke illegally onto the US.
Dooku would obviously be a British Count.
Yoda would be the highest ranking Buddhist monk from China.
Obi-Wan would be from the UK.
Sidious would either be from Switzerland or a scandinavian country.
Jabba would definitely be the boss of the Italian mafia.
Maul, Savage, the Nightsisters and Talzin would be from a warring tribe in a dangerous and wild area of Africa.
Chewie would rise from the poor neighborhoods of Brazil to become Han's partner in crime.
Windu would be the leader of a spiritual African tribe.